Bandcamp mostly. They do writeups sometimes like "the best metal from Colorado" or "a deep dive into acid jazz". They seem to be human written too and not ai slop, at least in the past.
Also seeing who's playing with who. If I like band A, and band B is opening for them, well I'll check out band B. I saw "Year of the Cobra" play with "The Well" and it was a good show, and I bought their album.
Yup, Bandcamp. You can also click on "Genres", then clicking on any genre will propose further subgenres. So currently i'm in a atmospheric black metal phase. Going to "metal", "black Metal", then "atmospheric black metal" shows me bands i might like.
Obviously genres are very fluid and sometimes subjective, but as a general tool to find music they work for me.