As I've said before he needs to learn how to move into the spaces where he becomes the right pass. This is what Casemiro does in order to get lots of touches. And perhaps he shouldnt do the exact same thing if Casemiro is doing it - usually offering himself deep to the backline, but he needs to learn to do something similar instead of waiting for the ball to come to him because often it wont and it will lead to having 34 touches like today. When Casemiro is playing and getting on the ball that much and doing the majority of the ball winning Mainoo's job tends to end up just running around doing the extra bits and we know he can do more than that which is why we ask to see it.
You can blame the tactics but for all their faults and weaker areas Casemiro and Fernandes know how to get on the ball and make lots of passes and get lots of touches. Those 2 and Lisandro average the most for us this season in those categories per 90 mins. And other than Fernandes the other 2 have been out with injury where even then our other players dont do the same. So they just arent as good with it or dont work as hard to get on the ball