[2021] How did you choose your role for ranked?

Hello people ! I'm Musara on LoL, and since the moment I began playing this game, I'm what I would call an "I don't freaking know what I should main". I like pretty much every role, got comfortable on some champions in each one but I get bored really easily of things if I don't get a level of accomplishment in something, it's what I'm looking for in ranked. The problem is that I feel like I don't have as much control on my games as I want, and it's pretty annoying to lose a game when you did good in it, so I want to get better at one specific role to be able to carry my team and myself more reliably. So I'm trying to force myself to choose a role and really climb with it, hoping the game will be funnier like that, but same problems happen every time. I don't know if some of you have lived to same, I would love to have an other view on this and some advice !

GLHF in your games and life !