This sounds more like burnout and, to some degree, boredom.
I've been there twice now, in the last 5 years. I've been lucky to have someone talk about the underlying desire to quit with me. I've also been unlucky enough to just quit and join a startup.
Instead of outright quitting, can you take 1 month off? Can you take 2 months off? Can you take some unpaid leave that's several months long for "mental health"?
Let's assume you can only take a month off, that's actually plenty of time to answer your question based on your own situation. Spend the first couple of weeks traveling or doing something that does not involve entrepreneurship or tech, just go enjoy the world for a bit, even it just means spending all that time sitting on the beach and reading books.
Spend the next two weeks working through your idea, either building a prototype or networking to meet potential cofounders or doing customer development or whatever.
Then when you go to work, really think about how to carve out enough time for yourself.
I really want to reiterate that this sounds way too much like burnout. Please be careful and consider taking some time first, just to clear your head and to think, before you just quit.