I personally don't want to see Osimhen in Napoli in the next season because I don't see a great future for such a great and fast growing talented striker like Victor Osimhen who has proven his worth to deliver in his own styles all the opportunities that come his way. I like to enjoy how the guy is so strong and determined then talented to crown it all. Any club that have a player of such caliber is meant to thrive successfully especially if the club happens to be an elite club and respects the worth of such player through appreciating him and supporting him.
I have been of same opinion too, Napoli isn't a good place for such a talent as osimhen if he wants to thrive with his talent, he doesn't even look well appreciated in the team aswell, so a critical look into everything shows he's got a very good reason not to stay any further in the team if he wants the best for his career enough to thrive beyond the point he has gotten to currently, he's has been able to get the team a whole lot so leaving them is fair.
Even when he went to represent his country in their African cup of nations tournament, he was one of the best players, and at some point it looked like the fate of his country team rested on him and he was able to deliver the best he could, obviously, there's more to what he can achieve beyond Napoli, staying back at Napoli will only impede his growth and his ability to scaling greater heights as a football who's still young, skilled and talented. Last season at Napoli has been filled with a lot of ups and down and it will not be healthy staying back.
Staying back at Napoli may affect his psychology and h8a overall performance because the team at some point wasn't giving him the very enabling environment to thrive and all his performance was shadowed by their poor and ineffective tactical approach to games aswell a s their strength in the pitch, he was their key player upon which most of the burdens was rested and to the best of his ability he tried well enough.