I see all the logic in trying to replace the goals Cristiano makes by signing an attacker but it will always be an expensive downgrade at this point.
Why not just sign another really good midfielder and let our attacking options -who should be fine for Serie A- do the trick.
Dybala, Morata & Kaio Jorge can split the striker position. Chiesa, Kulu, Cuads & Berna can take the wings. It's not ideal but neither is insisting with Bentancur, Ramsey or Rabiot ffs.
Get Tchouameni if there's some actual cash to spend.