Try to create a money earning format of gaming.

Ajmal_Amir20

If you just create a way of earning some money that will be great
for this game.

It can be a game format where everybody will get equally powerful champions.

Another way.
You can make lot of bg tournament where 10 players will be involved then first and 2nd winner will get some good rewards.
This tournament entry charge will be high.

And this tournament winner achievement will be shown in there account as well.

You can design a specific item. That item can be earned by lot of struggle,

And by that item a player can maximize 7* champ or he can gift to someone who is willing to buy. (In gifting events)