It sounds shallow, but having a lot of money rolling in to your bank account on a regular basis for the first time of your life will do a lot to you on a psychological level. You'll need that boost in both the emotional and materialistic sides. After a year or so of that, you have more options and can think about life or building cool stuff a little more.
The one thing I can relate to you on is feeling wiped at the end of the day. I worked in a startup-turned-unicorn a number of years ago. The first couple of years was extremely fun and exciting. A few years in, the company IPO'd, and work gradually became incredibly draining and boring. The worst part is, I had all these ideas about cool things I wanted to work on, but was too drained to work on them. I left that company after a few years and have been through founding a startup, failing and back to a regular employee developer since then. Through these years I have never lost passion and energy since. I guess the point of that anecdote is that I know how it feels being wiped at the end of the day, but I had financial security to allow me to leave it and start over. You'll want to get to financial security first.