Seperate tactics for ranked and league games
Right now, you need a specific strategy for league games, and a generic, robust one for ranked. If I want to put effort in winning my league games, I either have to change my tactics right before and after the game, which is sometimes not possible, or perform worse in ranked games, which means lower ELO and reputation, and worse sponsors.
While you could argue that there is a tradeoff for focusing on either ranked or league games, I will argue the tradeoff is already there in the form of fatigue and team ranked games. If you want to gain more reputation, you need more ranked games, which leaves you less games for training and streaming, hence hurting your long term team quality. I also think it is wrong to punish players for actively playing the game by catering their tactics to their opponent.