I was wondering for players who reach the end game content that perhaps you add something fun and ever changing so people dont get burnt out or tired. Alot of games such as world of warcraft, guildwars, blade and soul have battle grounds or open world pvp zones that give exclusive rewards for doing them. I feel you should follow this idea for mobile and even perhaps maybe making a pvp that is a set cp so people who are weaker or stronger will be playing against each other fairly and the winner be solely skill based. I hope this suggestion helps, I would love to see this game grow and be very successful.