1 new champ per month and 1 rework?
Here is an idea, instead of 2 new champs they can release 1 per month and instead remake/rework one of the really old ones that are completely useless, like your Irons Mans, OG Hulk etc and when i say rework i mean put the effort they would put for a new good champ to the old one, like new animations, appearance and skills. I think 1 new champ that would be relevant and well made is way better than 2 and it would feel more special anyways. This would help with their resources/time and money management and make the game a bit better too.