Spotifys algorithm doesn't do anything. YouTube is a tiny bit better. But it's very difficult. You need to click around to get out of the algorithm that shows the same thing for six months.
What do you mean by this? I discover a lot of music through Spotify.
My mix for discovery usually goes through:
1. Labels that release artists I already like
2. Recommendations from friends
3. Spotify recommendations algos (Discover Weekly, mixes, radio feature, etc.)
4. Music zines/magazines/blogs/critics.
5. Bandcamp recommendations (not so good but worth to check here and there).
Spotify is pretty good to recommend very similar tracks or artists, never had an issue with it so would be keen to hear what's your issue.