How have you not managed to balance a game that's been out for 7 years?
Every season is more unbalanced than the last because riot feels the need to do stupid reworks like rageblade, mordekaiser, graves, and other crap that was totally fine or maybe needed a small buff, but no, a game that was close to balanced is changed completely and is less balanced than you'd expect from a beta. League is one of the older and more established MOBA games; use that to keep your fans. Make it balanced and competitive, not gimmicky and annoying. You don't need to make a pretty champion with "fun" dynamic abilities (like a stun larger than baron pit) to make people play your game. Most of these brand new MOBAs are better balanced than this almost decade old competitive game, which is just sad.