Certificate level is so easy compared to professional & advanced, being part-qualified does not add much market value I'm afraid.
From what I can tell you work for a non-big 4 financial services firm (in audit?), you also don't seem too enthused about accountancy because people who have their eyes set on becoming an accountant would not quit ACA mid-way. If by quitting you mean you are no longer pursuing a career in accountancy, then just try a grad scheme at consulting with your economics degree. Quit after you've been offered. Spoiler alert: the hours in prestigious city institutions suck even more.
With a mediocre A-level and likely a non-target uni you've decided to throw your golden ticket away and settle with mediocrity. I've the perfect place for you: Civil Service. Maybe don't apply for the finance jobs because that'd require you to study in your own time as well, but as a policy person you will have an easy ride. Just don't get jealous when all your ACA-qualified ex-work colleagues overtake your salary 3 years down the road or you get let go in the next round of austerity.
Having a 9-5 is a dream every auditor at Big 4 wish they had. Your hours really don't suck that much and if by studying you mean self-study then 4hr every night you are doing it wrong for ACA Cert. Each paper with the exception of AC should take ~20hr lesson/self study + ~20hr question banks (a week of work), and you should definitely move some of that to the weekends and your annual leave days. I would not study for more than 2.5 hours after work.
From my experience just read the book once and move on to QB, trying to learn every concept in the 300-page book is a huge waste of time, this was what I did wrong at uni. I found it manageable because I strategically placed my annual leave around exams and used weekends to study.
If I'm being brutally honest, you need to work on your resilience. All junior level jobs suck, and you are not going to have worry-free cozy uni days again. I personally have friends in software engineering, medicine, law, private equity, banking. Those are the prestigious jobs and they all have worse hours than you. Those on easy jobs tends to be dead-ends and they'd wish they could work for Goldman Sachs.
Grind through the junior years and the 3-year ACA will increase your market value from 35k to 60k, then you can settle down for an easy 9-5 and cash in on your next 40 years of middle-class lifestyle.