Comments of chapter undefined of Lets have Fun with it

I'd say catch up to the group and see if you can change anything else about the plot line, but if you don't want to that then you could send him a big game/fictional world like destiny or dc/marvel for instance that way you have a bigger plot line to follow which could give you a bigger arc for the Mc in said worlds, or keep with a few more shorter worlds to build his strength up before doing said bigger titles