Help meee

Hey everyone. I am currently hardstuck gold elo, sometimes i get a bit higher, and i will drop back down to gold 4. I have already found the major issue in my gameplay, and i think this is that i have no champion pool. I litterly play random shit all the time, because i can not find 4 or 5 champions who i enjoy in the same role. I think that maybe if some of you can give me some suggestions on how to improve on this, i will be able to climb. But right now i play all five roles and i will play all kind of champions because i can't really find a main.
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