Well, I got off the "Must Play Harder and Harder Pieces" train about 9 months ago - shortly after I broke my femur. At age 71. I struggle enough with about grade 7 to make it seem like I am accomplishing something. I realize that I will never play the really difficult things. I could hack away at them and play them under tempo with lots of mistakes, but that is not very attractive for me. I want to play for others, either live or virtual, so I like to pick things I can play without being too ashamed of my efforts. I don't mind spending several moths on something if I really like it and I am making progress. When progress stops or becomes too agonizingly slow I have to set it aside and try something else. Bach's Italian Concerto is one such piece - I have tried several times to make progress but stall and lose interest. On the other hand Grieg's Wedding Day came together fairly quickly (90 days or so).
Luckily there are tens of thousands of pieces I can choose from. I keep a database of every piece I have performed either online or in person - up to about 150 now...