For low-rank game accounts, rank up is very easy. However, when the rank increases, if there are no discounts, they need to spend a large amount of crystals to upgrade their equipment. I suggest offering players who rank up a few hours of discount. For example, I rank up, the system gave me 2 hours with a 30% discount. Developers, please consider the suggestion. The current situation is that my account is about to be rank up, but there haven't been any discounts recently, so I have decided to stop playing this game for the time being. I believe offering such discounts will encourage more participation from lower-rank players.