Back in the day (~5+ years ago), I was a music major (not on piano, but on clarinet). I've picked up piano lessons recently with the goal of improving my technique. I did three semesters back when I was a music major.
My piano teacher has been ridiculously helpful so far with teaching me new things, and has given me autonomy on what I can play. With this, though, comes some responsibility on my part to choose the right pieces.
I'm not a fan of Bach, unfortunately. Other than his chorales, I find his music boring to play. I don't mind listening to Bach every so often, but I wouldn't want to put in the work to learn his music. (Yeah, I know some people are not going to like this... if I get suggestions to learn some of his two-part inventions, I will learn them.)
Czerny's okay: I tried the School of Velocity back in my undergrad, but found it to be... let's say, too much like Hanon. I do like his 100 Progressive Studies without Octaves that I've tried so far.
I'm all into late-Romantic, French Impressionist music (Chopin, Rachmaninoff, Debussy, Ravel, Stravinsky) and would consider myself to be at a beginning-intermediate level. I'm currently learning two of Debussy's Preludes (Girl with the Flaxen Hair, Footprints in the Snow) and have just finished the e minor and b minor preludes by Chopin - I learned them both within a week. I've tried sightreading Bruyeres from Debussy's Preludes but have found it too difficult.
What are some good pieces that you would recommend to me, given this information, that would help me improve my technique and would interest me to play? I don't want the pieces to be too easy for me, or too hard either.