Being able to work remotely and at 20-40 hours a week would change my life - seriously. I know there is lots of information around on becoming a freelancer, but do you have any particular insights?
Getting to 40 hours/week is trivial (or rather, the difficulty is all on the emotional side) - you walk out the door after 8 hours every day, and you do it consistently.
Getting down to 20 is much harder, as is getting remote work - all I can suggest for that is being upfront about it, and only working in positions/contracts that are explicitly remote-first.