All good suggestions for sure, including your idea of playing over a track. But may I kindly suggest that you challenge yourself and try to set a goal of playing at least one song every performance with no styles or tracks. Just you and the keyboard/piano. Maybe a vocal number with an instrumental chorus or two. You say that your your piano accompaniment sounds thin. Don’t worry too much about that for now. Just try to get your accompaniment rock solid. A good vocal and a simple and solid accompaniment can go a long way. Think of someone like John Lennon for example. By all accounts he was no piano virtuoso but he could accompany himself very effectively on piano.

I wish you the best with your musical endeavors,

Paul