The best thing Napoli could do at this point is to sell Osimhen to the club that's interested and ready to bid him for a higher fee even if it's less than what they're offering out there. For example, PSG is interested in the player and will be purchasing the player for a higher transfer fee than any other club out there now based on my assessment. If that's the case then I advise that Napoli do the needful by selling the player off to PSG at the pretty reasonable bargain they have at hand. Osimhen don't seem to be interested in working for Napoli next season because as a player, he has the ambition of playing for bigger clubs too and since clubs like PSG have shown interest in purchasing him from Napoli, I'm sure he won't hesitate to grab such opportunity.
Selling osimhen off hasn't been the problem but the Claus attached to his sales has been the major challenge the team has faced all this while and that has made it looked like almost every team who at some point showed interest are gradually beginning to withdraw their interest because they don't find the clause as such they can actually really cope with at this point, PSG who happens to be really rich as they are, not been able to completely afford osimhen is an indication the Claus is just not realistic enough except they would want him to stay back and later move as a free agent which I don't think osimhen is willing to do.