Need help getting to diamond

Hi so i have been stuck in plat for well over a year now and have been at plat 1 for months during summer and went to diamond promos so many times but never actually won them and here I am again just stuck so i am looking for some to help me by carrying or at least duoing. i feel my team is always holding me back with one lane always getting destroyed I know I should be carrying but i guess I can't quite carry that well so i need some help. Anyone interested?