If you have no idea what to sell then just teach everything you know (about one topic), try to make something useful for people and make it in public (e.g sharing your progress on your blog or YT channel). Worst case scenario, you'll have a job, be saving money and build a small audience / reservoir of credibility.
Also maybe start hanging out on Indie Hackers instead of here.
Edit: as the sibling commenter said, get your life in order. That's number one. Until you find a job and can cover your rent, don't even spend time on news aggregators. I wouldn't worry too much about timing to be a founder. Everyone feels like they're too late and they've missed all the opportunities but there's always a next big thing. Keep your spirits up!