I know Napoli got a rich owner and he can have enough money to make Osimhem stay in Napoli for the next season and since Victor Osimhem is a young player he can easily be sold for a expensive price in the next season if he improves himself. But since there are many tempting offers for Osimhem in the next season from teams like Real Madrid I think Napoli should start seeking an alternative player to replace Osimhem next season, otherwise, they will have problems just like what happened in the game against Ac Milan they failed without Osimhem.
I think Napoli should keep Osimhen because after being left by coach Spalleti, it is not certain that Napoli will be as fierce as this season and they could fall from the top of the table next season. Players like Osimhen are rare in Serie A and if he continues to be consistent he can contribute more to the club and become Serie A's top scorer again.
But sometimes offers from other league teams are sometimes tempting with such good performance and it seems that Napoli's owners will think hard to consider that. Now if the owner releases Osimhen then they have to find an alternative to replace it, but it's not certain that the performance is commensurate with Osimhen.