Yeah, and I'd totally just get a different job, but it's harder to job search for pretty much anything today. At least that's what I hear a lot, so I try to not waste my time on that and stick to what I'm best at, which is pixel art for now.
Viewing post in I love making pixel art, but not the career
It sounds like what burns you out is not the pixel art itself, but the freelance portion of it. Without fixed work hours it's really hard to put a stop to workaholism, since every activity you do that is not work-related feels like a waste of potential money.
Try to decide upon specific work hours, and enforce them strictly. Even thinking about work should be forbidden outside of those hours. That way, you can carve some time for hobbies, rest and socializing again. Don't neglect those things, they are what keep you productive during your worktime. Without them, it's straight down to burnoutville.
The other option is to find a contract job as a pixel artist. Having a regular job doesn't necessarily mean "cashier, cleaner etc". You already have great pixel art skills and a portfolio, you can just start sending it to game development studios that might be looking for pixel artists. You never know, they might be looking exactly for someone like you. And you lose nothing by trying. Having a regular paycheck and predetermined working hours will do wonders for you.
I hope this advice helps you in some way. Hang in there, my fellow artist. ❤️