How to fix your community? It's simple
Throw out everything Riot Lyte employed into the community that turned it toxic in the first place
Instead of perma banning accounts from playing for "toxic trash talk", perma mute them in game
Players who intentionally feed and purposely leave games, ban them from playing ranked.
I can be completely honest in saying I was perma banned in 2014 for being super toxic to players who intentionally fed games it was wrong to do but I felt fighting back against trolls was the only true way of dealing with them since they would just evade bans anyways by using throw away accounts, but when I was muted for being toxic against those players I quit being toxic and started playing games as a duo que with an employee at riot and actually turned my act around. At that point it was already too late and when the wave of permabans hit I was one of the small percentage to receive a permanent ban. After my ban I never returned to the game until tonight because I've had the slight urge to try playing the game again but I don't feel like being one of those jerks who gets banned makes a new account and curb stomp players as a smurf for 30 account levels it just feels scummy, so the idea of giving players a 2nd chance to prove they've reformed would actually be a really nice feature.