Sid,I think for a box to box midfielder,you should sign Luka Modric as a replacement as it is a temporary backup.And also use lucas paqueta in CM role. For CDM role sign Cheick Doucoure and rotate him with romeo Lavia
You should sign Kimmich he is a bit old but he give massive experience to your squad(Caicedo) and MaccAlister from liverpool he will be replacement for (Camavinga) and he has shooting he can play Box to Box
I saw the man city player and thought it was Erling Haaland and then i said to myself that he doesn't match what zidane is looking for so it can't be him 😅