Fully Qualified & no job

I am sorry to hear about your situation. The problem is that in education, all you need to do to progress to the next level is past the necessary exam and you automatically move up.
Work is very different. A qualification is no guarantee of employment and never has been. What employers are looking for is someone with the skills, knowledge and aptitude to do the job required such that the business will continue to make money. I imagine that a garage or mechanic is looking for someone who can work on most jobs unassisted without constantly asking for help or reassurance. Is that you? If not, could you ask to get some unpaid work experience because ultimately that is what employers want because it shows that you can do the job.
Good luck!

Are you ****ed? Hardly aspirational accepting a job that's way below your level of skill especially when you are more competent and comfortable in your prefered field of work.
Dropping down to these depths is both demeaning and demoralising after all your efforts to do far better.
Proves there is no skills shortage if out of your profession and forced to accept a crap job.

I'm more than competent within the field of mechanics with two ford capris and a 1994 granada scorpio that I'm now living in.
If an employers door is closed to fresh talent then there is no skills shortage.
Back in 2013 (after waiting 20 years of long term employment and crappy unskilled manual labouring jobs) I found work for around six weeks at a garage. I just couldn't believe it however, this ended up me having to take the employerb to a tribunal for paying me less than the minimum wage. The excuse from the employer was that I was only qualified to level 2 and his solicitor said I did all my college work at night school which wasn't true. Fortunately I still have every piece of my old college paperwork including my YTS apprenticeship acknowledgement which was presented to the judge on the day of the hearing. The employer was ordered to pay me £972 and its a fine example just what your up against with dodgy employers.
Faced with no job I then decided to gain further accreditations in the field of welding which were all free whilst unemployed. As soon as I passed Level 3 in mig welding plate at Burnley College I found out via a welding forum that you can then take mig welding level 3 pipe.
After searching for a college within the Northwest I gave up and started searching in Yorkshire, finally I came across Leeds College of Building. Enrolled and passed within 15 hours! Having never done any form of pipe welding before I think that was a highly commendable achievement...I was the fastest student they'd ever had through the doors. Some people have a natural gift to pick up the job very quickly...something all employers fail to recognise but most are just brain dead and ignorant.
I happen to hold 15 A Levels within so many different trades thus proving there is certainly no skills shortage. I could start tomorrow be it bricklaying, plumbing, electrical installation, welding, painting+decorating etc.
Experiance doesn't make you a professional and never will, if you are not qualified your not anything and never will be...your just out there to undercut the professional.
Qualified means you know your job and therefore deserve the credit for taking both your time effort and dedication to gaining a greater understanding of the job.
Experiance is all word of mouth and anyone can say they are experienced and it doesn't mean they are any good either! However, there is no substitute for knowledge.
'Learning by making mistakes' is an all to common misconception only the inept have inherited. I choose to learn by other people's mistakes by going to college and learning the correct way from a fully qualified competent tutor.
If you choose to learn by making mistakes how many mistakes until you learn? And who's to say after all your efforts you are right. It's not practical to learn by your mistakes as its both unpractical and often an expensive decision.
An education speaks for itself.
I'm fortunate enough to have dedicated most of my time to get qualified within many different fields, if a job needs doing I do it myself.
Can't believe how so many out there who have been to university are so incompetent they can't even wire up a 3 pin mains plug or even change a light bulb.
Fortunately my life is not dominated by TV and (I've never bought one yet and never intend to) I restore old vintage valve radios, many of which I sell on ebay.
You only get one shot at life so learn to turn your hand to as many different trades as you can...if I want something doing properly then I do it myself...I'm also ambidextrous so I can with either hand.

So if you have all that experience and skills, why can't you get a job? What are you doing to put off employers? They should be biting your hand off? The only thing I can think is that you are going in a bit too self-assured and come across as cocky?

You've claimed you are homeless and living in your car. Such a job that gives you a steady income is a far better than your current situation.
I suspect the barriers you face to employment have nothing to do with you being overqualified etc.

Went for an interview on Monday and was told your application will now be put to the employer for consideration...2 days later I received a message stating I was unsuccessful.
As I was shown around the workshop it clicked straight away that I wasn't going to get the job, everyone was much younger. Many companies prefer to maintain a young workforce and this was yet another. What was interesting (more BS) was that they were unable to find any reliable staff that would stay at the company...a common problem with young people as they don't want to know.
The job was well within my capabilities and only required you to have Level 2 in Light Vehicle Maintenance and Repair (suggesting they are desperate). I happen to hold Level 3 and much more than an ideal candidate for the job.
At the same time an agency called Autotech Recruitment Academy (that I'd previously signed up with when they visited college I was studying) said they have a position at Ford and am I interested being put forwards? Well of course and was most excited over the proposition, I was going to get a 12 month contract with a free toolbox and £1,000 of tools via the agency and yes. There was also an offer of being put for Level 4 Hybrid & EV and even further training. Being a keen classic Ford enthusiast the very thought of working for Ford was more than anything I could have wished for however it was short lived...
Several days later later the agency worker got back with a rude response from Ford... "YOUR TOO OLD AND SLOW"
My current situation allows me to sit and rot, all my achievements are on the back seat of my car I have been confined to living in for the past month whilst homeless with my cat.
The foundation stone was kicked from underneath me long ago...can't understand why I'm not dead yet as it isn't going to get any better and I know it.

Sorry to hear this. How old are you? 40s? 50s? 60s? +???
I guess if they are looking for speed, then that is what you have to offer no? Could you retrain? I retrained when I was 40 and nearly 10 years later am looking at the next step I plan to make which involves various elements of upskilling and networking. Perhaps if something isn't working, continuing to do that is not necessarily the best strategy. Could you set up your own workshop? A local business to where I live set up doing tires. They basically started with a tire machine and a trolley jack working out of a dump. They now do all manner of work, have jacks and lifts installed and the dump has been transformed with the profits of hard work.
Good luck!

I'm 49 and considering the ignorance expressed by employers it would suggest age is a major factor that dictates either yay or nay...this clearly represents age discrimination and it's in abundance. 'Too old and slow' before even being offered an interview? To be honest a response such as this clearly proves pure ignorance and I'd be a fool to even alow such a company a reconsideration.
The level 3 accreditation in light vehicle maintenance and repair I recently passed led to several distinctions and the highest achievement in the class of 15. I even beat 7 students in table football and never lost to anyone.
Clearly proves no skills shortage.
Without a job in the motor industry I have no chance of taking level 4 Hybrid & EV as its a requirement of the course to proceed onto this level.
There is supposed to be a demand for EV technicians...obviously not as someone has deliberately made it difficult to get to the next level. Its only a 3 day course and you need level 3 (which I already have) to take it.
Maybe the government may make changes when they realise no one is taking up the course in time to come.
I happen to be a mechanic and not a technician, a tec only clears fault codes and basic servicing of vehicles. A 'mechanic' is more advanced and will strip and rebuild an engine as well as diagnose faults...this is a mechanic in the truest form (not like the amateur **** on TV).
However, I'm currently long-term unemployed and now homeless with 15 A-Levels to my name and can turn my hand to most trades. I'm in excellent health and never drank or smoked either.
If I went on YouTube and opened a channel displaying every job I can do it would go mental...bricklaying, plumbing ,painting & decorating, welding, milling & turning, mechanics.
Sadly though humans only think in black and white and for that very reason don't realise a person such as myself can posess that many skills. I also happen to restore and service vintage valve radios from the 50's...sold 100s on ebay around the world.
Highly skilled yet left to rot whilst I sit here in my car waiting for another day to pass along with my cat...I'm really better off dead being overqualified as it also inhibits your oportunity of work as well.