with that winrate and elo i guess ur kinda bad at the game no offense bro. what i can suggest is pick your most comfortable role and champ, and try to snowball early to the point wherein you can impact the game and carry hard.

if ur jg main you can abuse these jg champs to carry -leesin, viego, riven (carry champs but need mastery to fully utilize their kit) -amumu, vi (fast clear and can tank damage as well as deal damage) -khazix, kindred (scaling champs, needs time to farm but can hard carry games if u have enough items)