This thread is great, I´ve been looking for new places to find new music. I use multiple sources on internet. Sputnikmusic and Lastfm to see their "similar" artist and also the ranking system.
I also use Rateyourmusic to see what album I should get.
For music reviews I use The Needle Drop, I also discover ton of music because of this guy.
On reddit occasionally you get good threads of music, especially on r/indiewok or r/listentothis.
I used to use Hypem a lot and I haven´t use it in a while but it´s a good place to discover music.
The blogs BeatsPerMinute and WeListenForYou are pretty good.
I really like mathrock and alot of blogs don´t talk about this genre so I go to r/mathrock. Edit:By the way if anyone wants to add me on Lastfm my username is kitinnitik.