I have a large list on bandcamp that I follow to try and stay up with as many releases as I can, also following relevant genre "tags" on there to get recommendations from artists I may not know about. The genre tags can be hit and miss though due to artists often being unable to tag their work properly.
I'll also listen to shows on SoundCloud and will search out tracks and new artists I hear on there. I'll also occasionally check the Juno charts if I have run out of new music to listen to and in the last year started building up a follow list on Spotify to check new releases there that I may have missed from all the other avenues.
Pretty much. They still run bandcamp Friday too when the artists get all the money for sales so I generally stack up my wishlist and try to make my purchases on that one Friday a month.
RSS is so handy, it's a shame it's not as supported as it used to be. I used to read a ton of webcomics, not all of them with consistent release schedules, some of them on social media sites I don't use much, and RSS was how I kept track of them all.