When I find something new, I like to look up live performances from that artist on YouTube. Sometimes people in the comments mention other similar artists or the source that led them to the video. YouTube's algorithm is a bit of a dark and dangerous thing overall, but I do sometimes follow a suggestion for music that I end up loving.
I think a willingness to listen to unfamiliar albums and unfamiliar genres is all you really need. I look for “best of X” lists, which get posted everywhere from actual newspapers to niche sites nline forums, Twitter, and personal blogs. Type in different values for “X” and you get exposure to more music.
Some albums you cannot get digitally with the best sounding master version.