Searching for new music is my favourite thing to do with streaming. With a good app (I use Auralic Lightning DS) it becomes a journey from one artist which has recommendations of similar and down the rabbit hole you go. I find with the huge amount of music, I will just play the opening 20 seconds of a couple of songs on an album and if I like the flavour that album goes into my favourites. I spend an evening doing that until I have a load of music I haven’t properly listened to yet, but sounded promising. Then the next evening I’ll sit and play those albums properly and delete those that I’m not into and keep those I am, hey presto I’ve just added 3 albums to my collection.
Aside from that, I will listen to YouTube mix’s and Shazam certain songs, or music in hifi demo videos, on tv or noted in print reviews. If it’s individual songs, wherever I am I’ll save them into my ‘test’ Qobuz or Tidal playlist, again ready to listen to properly at a later time. I don’t use the providers streaming apps much (other than to add songs when I’m out) as most of my listening is at home, but I remember when Spotify was my go to I would find lots of new tracks when it would continue playing at the end of your playlist.
For me though, finding new music takes the time spent doing it, I don’t think there is a simple way of having it served up. So I’d suggest dedicating 1 or 2 hours a week looking through artists and listening to snippets to build a catalogue of ‘potential’ new music before doing the critical listening, that has been the fastest way I have grown my digital collection.