I have two primary playlists, a metal playlist that spans a plurality of subgenres and an instrumental Mick Gordon Doom soundtrack-esque playlist, and then a bunch of different smaller ones (punk, rock, alt indie, norwegian space disco, etc.) for when I'm looking to change it up a bit.

I primarily listen through spotify (it's a family plan and I'm working on getting the person who manages it to switch, it's an uphill battle), which has halfway decent discovery through other people's public playlists and the new shuffle feature that weaves similar songs in.

Sirius XM is also a discovery and listening source for me, I like the hosts on channel 40 Liquid Metal and like how they promote new and small bands.