It's time to slow down new characters
I'm assuming a few already said this in the past, but that was the past and now we're in the present with a multitude of new characters. I think it's time to slow down the release of new champs and do it every 3 months or 4 months instead of monthly. And as a replacement for new champs, revamp old champs to meet the current meta of the game or revamp some of the newer champs that came out completely useless as if the developer didn't even bother playing with it prior to release.
If it's all about diverting your resources and saving expenses, please consider this suggestion. It'll make your player base happier.