Spotify's discovery algorithm is great. Outside of that I routinely check Pitchfork for new albums. theneedledrop makes good recs too and Any Decent Music is a pretty decent music review aggregator similar to Metacritic but for more niche styles.

These days I listen to a lot of dance music though, so I tend to discover music via DJ mixes on Soundcloud and Bandcamp. Their Bandcamp Weekly section is pretty great and you can easily find music by browsing record labels, people's collections or the "if you like x" recommendations listed at the bottom of individual release pages.