What is best champ/role to carry game

After some years playing support, the best i can do is chance role, i'm to bad to carry game has support, I mostly play nami and i can't do nothing, no matter how much I help my team, no matter how much wards i place none see map, so i'm giving up on support, is a role i like but i cant climb playing it. So any suggestion of champion and/or to have more impact and carry game?
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