I think you should make an option to gift donate and exchange excess gear soulstones diamonds or gold to friends. It could be a daily limit per person with daily total maximum limits.
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Gift donate exchange 10 items with 10 people per day
10 diamonds = 1 gift
5-10 soulstones =1 gift
Exchanges would be of equal quantity.
1 DD normal = 1 gift
This would help strengthen weaker players and could encourage spending for those desiring to help friends where spending may have stop due to having all hero’s maxed.
It would make the game so much more exciting for players who are waiting on new heros and for players who can’t afford to spend making the game more balanced. I think gree would see increase in revenues as a result I’d spend to help my friends while currently I’m not due to boredom. Just saying