It would be necessary to improve the way to equip the heroes, it is not possible that to equip with a specific team a hero you have to perform a dungeon 200 times, and on top of that when what you want comes out you have some statistics to make the team be A garbage to sell.

You should have a way to change those statistics, for example, to be able to change a primary or secondary statistic from flat HP to HP% or even to ATK%.

In this way people would be encouraged to buy equipment that you offer in the packs, right now I certainly do not buy anything knowing that you can leave something with statistics that do not serve you at all.