The people on Twitter said I should get a Patreon, so I did. You can check it out here.
As you can see, I don't have any patrons yet. Maybe I'll get one someday. Having a Patreon account is free, so I guess I can keep the page up forever, just in case I get any subscribers who use that service.
I also haven't had anybody purchase my Sherlock Holmes game yet. Oh well. I wonder how long I should keep the game at its current price.
[Edit: I got my first sale on the Sherlock Holmes game! Thank you, Amberly!]