Offer your thoughts or opinion on the input financial query or topic using your financial background.

Accepting personal “donations” (not as a non-profit)
Lots of webcomic sites now have "tip jar" links, or let supporters send money via services like Patrion. I presume other kinds of sites have developed similar solutions. I'd suggest you go out, wander the web a bit looking for such, then contact the sites' owners to ask how it's been working for them