Making things my own & playing freely, either with or without sheet music or a lead sheet to use as a reference. And doing it quickly & “off the cuff,” is a big want for me. Also honing my ear skills beyond figuring the melody & bass line to quickly deciphering chords replicating the feel if a song, especially if it’s not a “piano” song.
A couple of things I’d like to tackle in the future are Hotel California by the Eagles & My Immortal by Evanescence. .