When it comes to classical, we are all Cat 4s at best.
I like Satie a lot. I play
Gnossienne no 1 as well as others. I learned it many years ago. Looking at it through a Bach lens (interesting idea), I now hear voices and the subtle distinctions possible in the music versus a melody and accompaniment. How could I make it more haunting? FWIW, my teacher always says that slow pieces that seem easy are the hardest to perform and get right. Why? The speed makes the artist more venerable to noticeable errors where as fast pieces with a lot going on hide errors and the audience rarely knows what is actually correct.