Im diamond, now what?

I am a person who plays top. I hit diamond 5 a few months ago, but ive made 0 progress within this elo. Ever since i hit plat 1-2, i feel like my skills are done developing and i cant get better at the game. I was always a player who would slowly climb the ladder, but now i feel stuck. Any tips/videos i could use to help me better myself as a player so i can confidently say i am a diamond player?