Play scales everyday.

If you want to improve your playing abilities practice 20-40 minutes everyday. 

It is not enough to work a piece of music unitil you can play it.  To maintain that level you must continue to practice.  Endurance is only achieved by continuous practice – you will notice difference.  The music will get easier and you will sound better!

Know all notes, rhythms, bowings, fingerings, dynamic markings and be able to play them in every song.

Remember:  There is always something that you can perform better in your concert music.   Strive for excellence!