Writing/posting on Stacker News and nostr can also get you some sats. Especially if you look for topics that are underexplored (for instance: anything related to laws affecting bitcoin, macro economic stuff, weird events in the history of bitcoin, etc). If you have a personal hobby or passion that's not bitcoin -related, you could try writing about that. As long as you make it interesting, you won't do poorly.

If you're absolutely stuck on topics to write about, go down one of the following rabbitholes and write something about what you find there:

Mircea Popescu's blog Trilema Eric Voskuil's Cryptoeconomics NIck Szabo's blog Unenumerated

Final note: if you're goal is really just to get as much bitcoin as possible, you should probably consider getting a paid job in fiatland. You'll be able to acquire much more bitcoin that way.