I hate to do the old compare him with a similar player at your rivals, but Ozil needs to start looking at David Silva and the impact he has at Man City to see what he needs to start producing for us.
Very similar players and he gets regularly shunned out wide as Pellegrini plays two up front and yet still conspires to always get on the ball and be involved in their play. Regularly their best player.
I agree that behind the striker is his best position but he has to be more flexible and realise that someone as talented as him can make a significant contribution in a wide position. The team doesn't revolve around him.
By the way Ozil is apparently injured. Got a knock on his knee and is awaiting a scan on it. Whatever you think of his recent performances the last thing we need is another injury.