...Consist of?I myself gave up the 'dream' of being a concert pianist long ago, but I've maintained a passionate interest in musical creation; improvisation and composition.If your aim isn't to perform pieces, what kind of piano practice do you do? Maintaining technique is good for performing your own works of course, but is learning pieces valuable for the expansion of one's own 'vocabulary' and stimulation of new ideas via the personal creative transformation of the ideas of others?I'm curious if anyone else is in this same boat also?
Professional composer here.In addition to the fine advice given so far, make sure you regularly are practicing music dictation (often called transcription) by ear. Practice making variations on the material you transcribe. Make sure you notate out the source material and the variations. Do this by hand. Avoid computer notation programs until your piece is ready to be type set.Another exercise I found very helpful is to write out from memory, away from the instrument, a piece I know. Solfege is wonderful, and you can even give your self tasks of solfege a voice of the music. The basic premise would be that if composition is your end goal, then the more you train your mind to move at the speed of music, the better craft you will have.By all means, add improvisation and sight reading to the core list. It just sometimes is a "mind-set" shift to think of practicing as not just moving your fingers. Lead with your mind, and sing a lot.