Okay, seriously. Don't quit. I know that feeling is on your back and that you're thinking about it all the time, but don't do it. Believe me, that moment of relief you get and the time afterwards when you tell yourself that you're glad, that passes. In the long run, it just becomes regret.
Yes, I know, it seems pointless to go on. You're just rehashing old stuff and you've done everything. I get that. Only, that's just the way it feels. That isn't the reality. Right now, you're just burned out and because of that you can't think of anything good. It happens to everyone.
All you need is distance. You've been spending too much time on this lately and you've put off a lot of things. That's probably true. But you don't have to quit this to do those things. You just need to let this rest for a bit, so you can regain your perspective and remember why you got into this in the first place. In a few months, you'll feel better. You'll be able to look at this with a clear head again.
I've gone through this too. You feel like you're butting your head against the wall and no one seems to care. This is the best work you've ever done, yet no one seems to care. You've been pouring your whole heart into this and yet no one seems to give a gawddamn.
It's an illusion. People do care. They have noticed. But it's hard for them to express what they're feeling and their praise seems inadequate when they think of telling you outright. It's a communication problem, one brought about by embarrassment and uncertainty. It isn't that they don't think you've done great things, it's that they don't want to diminish those things with a few clumsy phrases.
So don't quit. Keep the work you've done and put it on a shelf until you feel better. It doesn't have to be all or nothing. When the cloud has passed and you're on your feet again, you'll begin to realize you never wanted to quit. You were just under pressure. It was stress. And you'll be glad you didn't make a hasty decision.
Then, when you start again, it can be just a little at a time. Bits and pieces. Nothing that's going to compromise whatever else you've started. You'll feel better, too, because you'll be fresh. You'll have gotten out from these frustrated corners you've driven yourself into. You'll see.
Give it a while. Don't force this into a decision. You're only tired.