Many new heroes have:
-too big damg ( fix by increase old heroes damg)
-Their annoying skill are way too long ( freeze of Elsa and Mr Big are an imbalance example)
Advice:Selling good heroes are good but you need to keep the balances in the game for new players and old players.
Solution:I suggest having a team maybe players if you don’t want to spend.They will give feedbacks about who is imbalanced and you just need to fix.
From player with love to Disney.