Also had pretty decent findings with http://www.gnoosic.com/ . Sometimes I now use my gf's spotify only for discovery, it's not bad. And some techno junkies in this room on jqbx https://app.jqbx.fm/room/brainwaves play decent stuff all day. It runs on spotify so, can't use it without a premium account (not 100% sure).
Over the last decade or more, I spent a lot of time on discogs.com for discovery, it's not good for suggestions ofc (unless you go to read other user's lists and read the forums), but to see an artist's / labels' whole release history is just friggin' amazing to me.