My best friends are Discogs recommendations, /mu/ sharethreads, and the people I can consistently trust with their taste on this site or RYM. Last.fm recommendations aren’t too bad either.
Really like a release? Check out what label its on and dig through its catalogue as well as await new material from it. And in that case, find labels that cater to specific genres to better satisfy your own tastes. Some examples that I actively follow:
Erstwhile - experimental, musique concrete
Music From Memory - “lost gem” archival releases
L.I.E.S. - industrial techno
Lobster Theremin - outsider house
Haord - zolo
Also only discovered this recently, but getting into V/A compilations are super quick ways to expand your taste.