I can't really say I know exactly how you feel, but I can safely say I've been in a slightly similar position before. And honestly, every time I look at frameworks like Angular or React, I feel like throwing in the towel right then!
I think it's a good idea to choose a niche, and stick to it. Full-stack devs are awesome, but there's nothing wrong in sticking to a particular competency. Looking at your profile, it seems you're pretty good at writing Swift/Obj-C apps. If that really interests you, why not stick to mobile as a domain? I feel it's easier to keep track of how the ecosystem changes, in one field.
As for jobs. I'm not entirely sure what the problem here is, but I know what it's like to not have the right qualifications. I studied engineering for two years, dropped out because the coursework had zero coding, studied Russian for 6 months and then dropped out again due to campus politics. But I've managed to hold jobs with IBM, Cvent and some media houses simply because I could convince the overlords that the lack of a professional degree didn't stop me from executing what was expected. But it was hard. Have you tried checking out spaces/events where startups converge, and probably pitch your skills to them? A good place to start would be coworking spaces. Establish a relationship with the space's owners/managers, and they'll happily introduce you to teams who need your expertise. Many startups don't care what certificates you've got, so long as you add value. And if there's a startup that does look for a degree - well, you probably don't want to join them anyway.
I hope this helps. Please don't give up - obviously you love writing code, and there's no reason why circumstances should make you give up doing something you love. :)