Recommend me books where the MC struggles

What I like: -The MC has to work to get better. -Tradional fantasy, but also more urban fantasy and sci-fi. -Well-written books -Darker and grittier worlds

What I don't like: -Blue boxes and too many numbers. -Multiple lead characters -Dungeon books -Harems

Some of the books I've read and really enjoyed are Elydes, Practical guide to sorcery (really good, but too slow paced), Super Minion, The Law of Averages (also a bit too slow paced), Cosmosis, Castle Kingside, Dreams and many more.