Me and a friend of mine started playing the game 3-4 weeks ago and we are almost lvl 80. However, it struck us that almost no one plays co-op and it's hard to find players to beat the bosses with. I was writing in discord with some older players about the co-op mod and it turned out that they have farmed all the 5* weapons and see no point in coming in to do this co-op mod.
This leads me to the following thought, change the rewards in the co-op so that both old and new players are motivated to do it.
For example, with each boss by increasing the difficulty, the tangible amount of COGs should also increase, as everyone needs them one way or another; Keep the drop rates of the current rewards also. That way, there will be an additional secure reward.
And to keep the old players motivated, let's add about 50-100 black cards to the 21st kill of the bosses, so everyone will strive. Оr to make it smoother during the week, let it be 30 BC on the 21st kill and 10 BC per day. This way it will be easier to find teammates to play with on a daily basis and this mod will make sense for everyone.