Don't sell Willian. Sell Pedro instead. Then buy Sancho and rotate both of them. Also, Antonio Marin of Dinamo Moskva is a good buy for LW. CHO eventually hit a ceiling of 3 stars potential in my save even though I gave him a number of starts on both wings. Also, if Kante elects to go, sell him. Milinkovic Savic is more than an able replacement + he would bag more goals than Kante. The only downsides is that 1)he tires out easily, 2) he can never be your defensive midfield option 3)neither can Jorginho.
Belotti is a bad idea. He is largely inconsistent in the buildup play phase. I would recommend Lautaro Martinez, Maxi Gomez or a personal favourite: Fiete Arp of Hamburg.
Also for FB, buy Josha Vagnoman. Solid, young, develops rapidly with more minutes, capable replacement for Azpi. Sell Alonso if need be cos that guy is instant rubbish.
Ampadu too should be given minutes.
Errrrrmmmm...also look at regens cos sooner than later you would soon start having EPL rules registration issues. And if you have lost Caballero, look out for Ben Foster, Fraser Forster or one of these English GKs that dropped to the Championships in that first season. Should help with that.
Also, sort out a Spanish club affiliate for foreign purchases and loans to balance out work permit problems.