For country and folk you should check out the labels “paradise of bachelors” and “Tompkins square”. Good mix of new and reissues. There’s a book called “penguin guide to jazz” that can help you cherry pick some albums to listen to to figure out which types of jazz / which players you like. For rock check out what came out in the 60s and late 70s. 77-80 was a wild time for rock/punk! I don’t know edm… have you tried “gas”? He’s got some great albums.

I’d check old album reviews from tinymixtapes (sadly defunct now). They had a section called “Eureka!” that was a fantastic way to stay abreast of new albums, especially electronic and hip-hop.