I am naturally left-handed. I believe this gives me quite a head start with developing a very good left hand.For one thing, I can play left-hand octaves very quickly and accurately. Naturally, for someone like myself, right hand can be quite a struggle sometimes.For one thing, I play left-hand trills very smoothly and well, but struggle with right-hand trills. I expect this would be reversed for persons who are naturally right-handed.
What about Liszt Mazeppa etude?It's the most hard Transcendental etude of liszt and it's great for LH...Here is Berezovsky plays the Liszt Mazeppa:https://youtube.com/watch?v=9XTpwihpddI&search=mazeppa
OP states he's level 7-8 and you are saying Mazeppa, Chopin/Godowsky? what?Chopin Op. 10/12 even would be very challenging.