Become a contractor. Work 1-2 months/year and spend the rest of the year doing what you want.
Paradoxically, FT jobs are more liberating. You have less time, but you own that time. You can work on random things at 10 PM or 4 AM.
I keep seeing this suggestion many times, but I can’t understand what does it mean being a contractor, or how does one become a contractor. So would appreciate some explanation on the topic.