I sat and analyzed the things that were bugging me most. It turned out it was the hour and a half commuting on ridiculously crowded trains every day, the total

I sat and analyzed the things that were bugging me most. It turned out it was the hour and a half commuting on ridiculously crowded trains every day, the total lack of privacy I had in my open office, and management which wasn't flexible about my hours. So I ran away to Europe for three months and when I came back I landed myself a remote job. I love the product, management is very handsoff, and I'm basically left to myself most days. I get tons of work done because it's so easy to focus. I'm never on a super crowded and long commute (or at least not daily). Everyone in my company is always happy to hear my updates which I post here and there as I work. And sometimes I take a nap for thirty minutes during lunch. Life has never been better for me. I've eliminated the bad (commute, bad management, lack of privacy, inability to focus in a crowded office environment) which lets me focus on the parts I love (delving into a problem and solving it, letting myself be tired when I'm tired, not bounded by hours but instead by output). It's not for everybody, and I love seeing my coworkers in the office, but I have enough of a social life I can make sure I'm not ending up a loner. So in the end, I recommend identifying exactly what it is that's burning you out. For me it was the aforementioned issues, for others it might be something else. Once you can solve for X, Y can be less burnt out :-).