The term "expanding your repertoire" is often misinterpreted as "learning pieces that I should be able to play as a pianist". Looking at the things you have done, it all seems very bog-standard if you don't mind me saying.
I personally count "expanding repertoire" as three main things. Firstly, playing pieces that you'd like to play- this is always important. Secondly, learning about as many different styles of music as possible. Finally, developing and pushing forward technique.
I would question, for example, if Children's Corner really broadening your knowledge of French music having played Clair de Lune and La fille aux cheveux de lin? Is it really necessary to learn all of Bach's Inventions or Schubert's Impromptus?
Studying music at college, they will really expect you to go beyond well known repertoire. Also, they'd rather you go there with a balance of things under your fingers played really well rather than a lot of stuff "just about there".
I would approach it like this:
Baroque: you have a Bach Prelude and Fugue, so just work on polishing that. Maybe look at Scarlatti Sonatas if you want something new from this period to work at.
Classical: look outside the Mozart Fantasy and Beethoven Pathetique. Maybe have a go at the Beethoven op.26 or op.90 sonatas which are on par with Pathetique but less cliche. Or look at Haydn or Mozart sonatas. Or even outside the Sonata- the Haydn Andante with Variations in F minor should be manageable for you, or the Mozart Adagio in B minor.
Romantic: again look outside the Liszt Liebestraum. If you would like to learn a Chopin etude, maybe look at the Nouvelles Etudes which are not as difficult as op.10/25? With a lot of hard work, some of the op.10/25 would be approachable, but you need a solid technique for all of them; my favourite example: the op.25/6 etude will not enable you to play thirds, you should already be able to play them before attempting it (scales in thirds, Czerny etc.) All of the Chopin op.10/25 are like that; you need a grasp of the technique before you attempt the etude. Something equally interesting would be the Liszt Etudes en 12 exercises, which are the bare bones of the Transcendentals. They are fun to play at intermediate level, and you will recognise in many of them easier versions of passages from the Transcendentals.
Early 20th Century: you have a couple of Debussy pieces and the Joplin, so perhaps some Rachmaninoff or Scriabin? I would suggest the more approachable Preludes of either composer. Or some Schoenberg or Bartok or something?
Late 20th Century/Living composer: the ABRSM Spectrum series are fantastic for broadening this area of the repertoire. Spectrum 4 is leagues below your current level, but books 1-3 would suit you. They are basically compendiums of pieces by a range of living/recently deceased composers.
I'm sorry if this hasn't been the reply you're expecting. Others may respond with a list of pieces you would expect to find in any "favourite piano piece" books, but I would strongly advise you that playing nothing but such pieces when you are expecting to go to college for music is an incredible waste of your efforts as they will be expecting you to expand your repertoire outside this from the outset.
Topic: expanding my repertoire for college??? HELP!