Hi Tkyxd,
In my opinion, Pathetique is easier than the third movement of Moonlight, but I think both are within your ability if you can dedicate lots of practice time to them. If you would like to learn a Chopin etude, I would suggest op.10 no.3/6/9, op.25 no.1/7, and his easier Trois nouvelles but always choose one that interests you!
There are lots of pieces that I would recommend, but what are some other pieces you like or would like to learn? Based on the pieces you would like to learn, here are a few suggestions: Chopin Nocturne op.9 no.1, Chopin Nocturne op.27 no.1, Chopin Nocturne op.72 no.1, Rachmaninoff Prelude op.3 no.2, and Ravel's Pavane pour une infante défunte.
You can find music for all of these on imslp. I think they're all within your grasp so let us know how it goes! I hope you liked the suggestions :)