Make it so you can't play new champs in game
I think it would be a good idea to make it so people cannot play new champions in a ranked game. Nothing crazy just at least 2-5 games played so they at least know if they can understand the champion or not.
This will DRASTICALLY in my opinion reduce the amount of unintentional feeding... I can't count the number of times I have seen a brand new yasu, or any adc, or jungler hop in ranked and just do absolutely horrible. Plastic tier 7. Because they have never played the role or the champion before. Literally dead weight to the team.
btw