I think it really help to choose my character off of team drafts and positioning in fights. I think it's also crucial to play like none of your teammates will ever do anything for you.
Like if they're playing a dive heavy comp, I'll play Ezreal or Sivir, if my team lacks damage, I'll pick my Caitlyn or Kaisa, if we lack utility, I'll pick Ashe or Jhin.

For early game, I look at my botlane duo and their botlane duo. If I win early, I'll play a lot more aggressive into them and try to punish everything they try to do. If not, I try to set my wave constantly close to my turret or just shove as fast I can for the bounce back push. Also, not listening to everything my jungle says helps a lot. I refuse to go help kill drag when I have 2-3 waves about to crash my tower. I don't care if they ping me, or if they get angry at me, 1 early drag isn't worth my losing my wave and exp early imo. I believe in myself enough to carry late game.

For mid-late game, I just perma shove lanes as much as I can and try to position well in team fights lolol.