World Tiers to cater for both casual and hardcore players

Hey Devs!

I love the game so far and would like to commit, but find it hard due to the time constraints I have. I would love to ask if you can implement world tiers that can be maunally changed to alter difficulty in exchange for greater rewards. The purpose of this is to keep casual players involved who dont have much time and allows hardcore players to gradually challenge themselves along with casuals at their own pace. Thanks.

when they add multiplayer co-op it gives players the easymode they need for proggress