If you want to hear what you want to hear in (CD or higher) quality streaming, sooner or later you will have to pay. In that case I can recommend my favourite, Qobuz. You can try it free for a month. Be prepared to stay, it is addictive. They have tons of suggestions in all music genres.
If you just want to find new artists without paying, and you can stand the ads, you can use Spotify. I liked it before I had first made a direct comparision between MP3 and CD on an AKG K812. I thought "oh, never MP3 again". Then my audiophile jurney started. Since then it has found it's place again, mainly on the go, when the background noise destroys the nuancen anyway, or the track can not be found on Qobuz, or the available bandwidth is not enough for HiRes streaming.
P.S. If you do not mind stacking you are not limited to the Cube APK list. You can use the Cube as USB DAC and amp with your phone or PC. Then any app can be used. I just mention it because it took me some time to realize this possibility. Somehow the KANN was not listed among the best mobile DAC/Amps on some hifi sites. For this case there is a funny streaming app from Greece, called "audiophile stream network".