I had the same problem, when I was an intermediate player. Make the transition to the next level by modulating and playing in all twelve keys. Each key has a different feel, because the black and white key combinations are different for each key. Each key has its own tonal color. I had mastered C and all the flat keys. When I practiced those were the keys I practiced in. My music got stale to me. Other people liked it. Even when I learned new songs, they would always be in those keys. "Thank You Lord"( for all you've done for me.)by Walter Hawkins came to me while I was sleeping in Aflat. I went to the piano in the middle of the night and played the whole thing, encluding the bridge. "It could have been me out doors, no food ect...everyday by your power you keep on keeping me ect..." The next time I heard the song on the radio I realized it was in A flat.Anyways, start your practice in BMajor. or EMajor or D Major. The sharp keys or funny keys. As you transpose you will make some mistakes you will play the wrong key,a half step off. You will suprise yourself nicely, with a new color a new voicing for tunes you have been playing for years. Even if you transpose precisely, from key to key you will discover something unique about each one. Self discovery through trial and error will freshen your playing as what you have discovered in unfamiliar keys can be done in old familiar keys, giving your playing freshness overnight.
