In addition to the tips on the practice
page, be aware that professional pianists also practise slowly to increase motor-coordination security. The great Russian pianist, Sviatoslav Richter, believed that the act of playing a concert reduced one's control of the pieces and went through them again slowly at home after the concert.
So remember that even if you are advanced, slow and thoughtful, hands separate practice is still essential to maintain your repertoire, as it's all too easy to play fast with your acquired skill. After practising slow repetitions on a trick passage, I like to test it up to speed now and again to see how much progress these is before resuming slow practice. It's important for the fingers not to run away and operate faster than the brain.
Stay relaxed and flexible and don't stop practising scales, arpeggios, broken chords, double 3rds and octaves in all the keys and not as fast as possible. Stay within your comfort speed zone, so that you can listen carefully and think about the musical aspects of your performance. Work at memory
and use your knowledge of harmony and chords to help remember the structural patterns of the music.
Backup your acquired keyboard skills with musical study of the historical context of the music and the life of the composer. This will improve the integrity of your interpretations.
Try and play to friends and relatives as often as possible to get the feel of preformance and musical communication. This will assist your progress and ensure that your piano playing is not just an isolated activity.