I think best use of him is when the opponent is sitting deep and we need a goal. Despite him being at the end of his career, he's still the most creative player we have and if opponents given him time on the ball, he's able to find passes that most of our other players don't or time his passes well (the timing and weight of the pass for Pavard was excellent).He can play well as a AM behind two strikers. Problem is that this works only if opponent gets a red card.
In these situations we need to put him on in addition to having two forwards as he's very rarely in the box.