How would you upgrade my team?

CR7, Gullit, Matthaus, Hernandez, Milinkovic are tradable, the rest are pack luck. I’m thinking that I sell CR7, but who do I buy and should I change my formation?

CR7, Gullit, Matthaus, Hernandez, Milinkovic are tradable, the rest are pack luck. I’m thinking that I sell CR7, but who do I buy and should I change my formation?