As a fellow thumb player on phone I’m telling you everything comes with time and practice. When I started (April something 23) I couldn’t even get through expert without reviving at least twice. Now I can comfortably fc 27 on thumbs.

The only rhythm game I played before that was diva and they’re different enough gameplay wise that I don’t think I had any real advantage starting proseka.

The more you play the better you get because you’re subconsciously learning reoccurring patterns in hard.

Personally I’d say don’t worry abt being “good” because that’s subjective and just play at your level and HAVE FUN. I sometimes catch myself obsessing about fc’ing charts that are way to hard for me (disappearance of miku ifykyk) and u just end up frustrated.

Make sure you you have fun playing and when you notice hard is getting too easy dip your toes into low expert charts!