>>1062374This. Get fit while you're at the gym; makes ya more marketable.
And assuming there're libraries near ya, get your fucking GED; only means more job opportunities for ya.
Then, if ya wanna be more productive, you can try to get involved in whatever homeless resources that're undoubtedly available in your locale. Shelters, churches, libraries, and communiy colleges normally have a fuckton of misc quality, collectively.
Otherwise, I dunno, refurbish computers for the elderly; easy $100 dollars whenever someone answers your newspaper/craigslist/mailbox ad.