Take a break. What happens when you keep pushing yourself when you're already burnt out is that you get increasingly little work done that is of worse quality than if you just rested.
I've taken breaks from making my game before, and I always feel rejuvenated and clear-minded when I come back. If you feel any anxiety over stopping work, just remember that the game will still be there when you're ready to start working again.
I see. What is the reason you started making your game in the first place? Is it a game you want to make, or one you felt you had to do for some other reason? Were you passionate about it before? Why did you burn out originally, and have you done anything to address what caused that feeling?
In my case, I had stopped work on my game for about a six month period. But once I started work on it again, I regained my old momentum very quickly as I still loved the project I had started. But it's a labor of love I am deeply passionate about, so that well of motivation fuels the discipline and consistency I need to keep working on the game even when it's not always fun to do.
