Go all in for him. We can pay more upfront than any other normal club now that we'll have about 200 in cash. While the other teams will surely want to structure the payment for 5 years or so, with equal installments, we can pay like 130-150 from the get go. Monaco could also be persuaded into selling him this window if we jump with the dough.
Sure, Mbappe could reject us for RM or whoever but we should absolutely try to see if he can be convinced. It would kill me inside if he becomes the next big thing and we didn't even contact him.
Next thing you know, we're paying the full release clause of Paulinho and try until the end of the window to sign Coutinho only to get rejected over and over again by Liverpool.