For a start and based on the formation you are playing ... you are very weak on your left side .. planning for next season, I'd say you need 2 new left backs ... I'd look at bringing in a 5* quality LB this season and another one of higher quality as soon as possible next season, selling the one you already have.
I'd also try and bring in a good quality AMR, just to give you the option to play a wide attack if the need arises.