Stop working so fucking hard on apps/websites/digital junk that helps no one, except by making your boss rich (be it manager, VC, or otherwise).
If you engage in meaningful work, then it is impossible to get burned out for too long.
Stop being a drone. Take a step back and look at the big picture and ask yourself: what am I coding for? Who is going to use this? Will it help anyone in any meaningful way?
What is "meaningful" is up to you. Just make sure it matters to you and own it. Don't let someone else own it and dictate it to you.
Set yourself free, and cast off the 24/7 toxic work culture of SV that's keen on producing useless shit for problems no one has. Don't let yourself be consumed by the entropy emamanting from startup land. You don't have much time on Earth. Don't give it to unworthy efforts and assholes.