Hey, to me it also looks like getting this player to move and not stay in the same position with help a lot. He is obviously weaker in the forehand and tends to be more passive on this side which gives you more chances to attack.
So be sure to mix up your serves and bring him into eh forehand half too which will open up the table and more angles for you to play into. If you can avoid long pushes into the backhand then definitely do that. Try to return straight away wide into the forehand and get your topspin in, aiming into his crossover point is great with this topspin as he is quite tall and seems to struggle to adapt to that placement!