One of my biggest musical challenges is getting my RH faster with different scales and in those "awkward" keys. I can chord all day, but I can barely run to save my life. I see musicians all the time using fancy runs, but I see them in the same keys that most people like (C, Eb, Ab, Db, and Bb). When I come across someone who can beast in A just as easily as Ab, that will be my new teacher, lol.
I also struggle with the introvert thing. I'm a real home body, so it's hard for me to want to go out and do stuff when I'd rather stay home and do Sudoku puzzles and listen to music.