I have always wanted to play (I dont know how it's named) those progression in the same chord, and you go ascending or descending really fast, like in moonlight sonata 3rd movement
something i always think is that i dont want to repeat the sames always, like when playing the chorus, "oh i play the base chord like along with the melody", I want to play the " base chord, and add emotion with my left hand, like moving up and down in the chord, maybe add some jazzy style, or bluesie, and with my right hand play the melody, but add new thing to hit, like playing some parts in chords, add some high notes with lesser volume so i don't disrupt the melody but i can still add more things"
i would also love to learn to read and play at the same time, i would love to know how to improvise at a more advanced and complete level, make my fingers faster, specially on the tiny weak ones (4,5)