The only folks I know who make serious money here these days are the ones who regularly write

(1) porn a.k.a. erotica or

(2) longer nonfiction articles about topics like AI and crypto and finance or

(3) self help

If you're interested in exploring the ins and outs of writing on Medium and writing in general, you could check out Ask an Editor, the Medium pub where I collect everything I've written on those topics.

https://medium.com/ask-an-editor