If you are quiet, you can play Bach's "Twelve Equal Laws" piano music (I) and (II).
If you admire wisdom, you can play Mozart's Sonata in C major or Sonata in A minor. If you are passionate, you can play Beethoven's sonatas such as Pathetique, Enthusiasm, The Tempest or Wallenstein. ?
If you are good at lyric, you can play Chopin's Nocturne in E-flat Major, Mazzuca in B-flat Major, Fantasy in F minor or Narrative in G minor.
If you are full of fantasy, you can play Schumann's Childhood Scene or Butterfly.
if you like to show off your skills, you can play Liszt's Etudes (Twelve), Hungarian Dance (No.2) or (No.6)
The above music is often played in piano solo concerts, and they are all very nice. (In fact, the ideological and philosophical nature of these works can be summarized by more than the word "nice". )?