Hi! Sorry to hear you're not liking your course. I dropped out after the first semester in academic year of 2017/18 so I understand! I'd say in your circumstance, if you've lost all motivation to study then carrying on would be a waste of time and money. After all, university is a product, and if you're not using it then why spend money on it!
I didn't switch courses myself, but I have re-applied for 2019/20 entry and in my application I did not once mention about dropping out. Not in my personal statement or in any references etc. As far as I'm aware, the uni's I've applied to (and got offers from!) have no idea I even went to uni in the first place. To them, it looks like I've taken 2 years off before going to uni. The difficulty arises in writing your personal statement, if you don't mention going to uni, how do you account for your time spent there? Or anything you've learnt there?
I'm not sure about joining past the deadline. I did start an application to do so last year for 2018/19 entry, I would have carried on with it if I felt prepared enough to go back to uni so soon. From now until September is not a long time, ask yourself, do you feel you will be able to go back in September and do it again? Will you feel motivated enough by then? If so, then go for it! There's nothing to lose (except from the application fee).
In terms of references, I used my mentor for where I volunteer. This was fine for all except one uni who wanted specifically an academic reference. I asked my old head of sixth form in that case, and she was more than happy to help. You could probably use your boss as a reference, though you might have one or two annoying unis asking specifically for an academic ref, like I did! In any case, cross that bridge when you come to it.
Does it look better? Perhaps. Depending on your course, you may get a qualification for completing one year. In that sense, your time spent there wouldn't be a "waste". But will you be able to complete the year to a standard you would feel happy with if you have no motivation? If you think you'll fail, then I don't really see the point.
The other big problem is accommodation. I was lucky in that my accommodation was organised through the uni and they terminated my contract the day I moved out. It sounds like it'd be a lot of hard work for you to pay off your rent. Are you able to get another student to take over the contract? If that's the case, you might be able to say 'I'll carry on at uni until someone takes on my contract'. If they don't, then that's your decision made for you! Will you have a place to move back to if you leave? I'm back living with my parents but they do struggle to cover the costs.
Ultimately, it's your own choice. I'm bias because I think if you're not happy doing something, don't do it. And dropping out has worked out well for me. It's meant I've have time to work, save up some money, volunteer, see my friends etc without suffering the effects too much. I am currently 8k in debt with nothing to show for it, and when I return to uni, I'll have amassed a greater debt than other students because of this. But I didn't let this stop me from making the best choice for myself, and I'm happier for it.
I know our situations are different but I hope some of what I've said is helpful. Feel free to ask any questions
I'm more than happy to help!