Lumin U1 streamer here. I do a lot of my music organization and searching in the native Qobuz app itself but use the Lumin app for listening.
Lumin has a function where you long-press a song, album, artist, etc., there's an information button that brings you to a discography webpage that has a tab with similar artists. I use that frequently and lets me do a deeper dive than just seeing suggested songs.
But by far, the best source of discovering similar or new music are the music sections of Audiogon and others. Hearing fellow user's suggestions in specific genres, female vocalists, best guitarists, etc. is an amazing way to find great new music other enthusiasts endorse.