I no longer perform, and never did teach, so I rely on "internal" motivation to keep practicing. I might not practice as much as a professional, but I practice enough to maintain skills. I have been playing trumpet for over 40 years. Some of the best times of my life and my best and fondest memories have something one way or another to do with music and/or the trumpet. So, a big motivator for me is nostalgia. I want to keep my ability to play the horn in reasonable condition so that I can continue to do something I have done, and derived much pleasure from doing for many, many years. I don't want to let go of it and see it become relegated totally to history, so to speak. And, I simply enjoy it...it is more or less and hobby for me now, and I am motivated by personal enjoyment.