Figure out what you were missing in your last job and find a project that provides those things.<p>Alternatively: pick up climbing and enjoy life more.
Congrats! You're going to go on a spiritual journey and find out so much about yourself.<p>My first piece of feedback is to find a source of income that doesn't involve getting a normal job. Money will run out faster than you think.<p>Since you're a developer the obvious choice is to do some freelance work. It does take some time to find your first client. Waiting until you really need money will cause you some pain.<p>Since this is Hacker News I'm assuming you want to start a startup. Make sure you don't think about the idea only. Start with users and the problem you're trying to solve for them. Actually talk to them to understand them deeply. A lot of first time founders never talk to users :)
Fun times ahead. Take a few days off and do nothing except for sleep, eat, and play with legos.<p>Don't think about income for a few days. You need to get used to the unstructured life first, and i know it took me months to get past the whole idea of looking to others for feedback.<p>Once you get past that point, then spend a few days with a notepad and just write every thought that comes to your head. If you have nothing you are interested in working on, that paper will most likely be blank and you can go back and find a new job.<p>If you do have something of interest, then come back and discuss (or spend some time on a prototype and then do a show HN :)
I'm in the same situation dude, except my background is in mechanical engineering, structural analysis, which I find very limiting intellectually and limiting in what I can do with this skill. If I were a full stack developer I would read books of whatever my interest is and find interesting problems to solve. I think I'm going to learn some coding during my spare time, but I have no clue where I'm going, I just know that big bucks in exchange for my precious time is not worth it for me. I want to use my precious time working for myself , follow my interest, my ideas, be able to get creative and find intellectual challenge in what I do every day.
Use the leftover salary from your previous high paying job to take a well deserved break. I think your question will answer itself over the course of a month or two of relaxation.