The ability to play the beautiful pieces that i love, things like the Ballade in Gminor. Pieces that move me
Are you talking about Chopin Op 23?
That's a monster! I don't even have nightmares about playing anything that humongous. Of course, I'm just a newbie still trying to learn Für Elise.

So where are you at with the piece?
What is your method of learning? Sight-reading, hands-together, in-pieces, hands-separate, etc, etc???
Have your read Chang's book on the Fundamentals of Piano Practice?
You say that you don't feel that you make any progress.
Are you keeping a log of the progress you make each practice session?
When do you expect to learn the whole thing?
Is that target realistic?
Do you expect to memorize this beast or play it by sight-reading?
I'm not asking these question for me. I think these are questions that you need to ask yourself, and post explanations of how you are approaching the study so other people can make specific comments and suggestions on what you might try or change.
The only thing I know is that if I were going to tackle a piece that huge I would definitely do it in like a billion sections and be elated when I can just play a small section of it. Then put the sections together as you go. You wouldn't even need to necessarily learn them in the order they are played.
If you are already playing level 8 pieces you must have some method for learning already. What pieces have you learned and how do play them? Sight-reading or memory? How did you learn them, piece meal, or as whole pieces?
Maybe a small introduction of your methods will help people give you ideas of how to attack this beast. I'd really have to be into a piece pretty deeply to learn something that huge. I do have dreams of learning Beethoven's Waldstein someday but I know I'm not even ready to begin on it yet. I think I'm probably at level minus 8.

But if this piece moves you I KNOW you can do it. You just need to find the correct methods to make good progress with it. I learned from Chang's lot of methods that helped me learn much faster than I ever dreamed possible. I'm STILL learning about how to learn. And I'm making progress that has me standing in awe of myself. So the methods are out there, you just need to find the ones that work for you.
If you can be specific in exactly what you're "walls" are you can find methods to break them down. You just need to take on one wall at a time. And sometimes that might call for a side-track that you really don't want to do but is necessary if you want to succeed. That's when you have to bite the bullet and take the pain.
