I think Osimhen is smart enough to bargain for a salary increase and still stay in Napoli, so that he can leave next season for a top-level club and with the same top salary. Now the only question is whether he will be able to spend the next season at the same level. If so, then the player will have a brilliant future. I just think that it will be much easier for Osimhen to do this now in Italy than in England, where, according to rumors, the footballer then dreams of moving.
Given the high quality and numbers made last year, I don't see why what you say shouldn't happen.
He's a very capable and very strong player, plus he has a good way of thinking, like a winner! I think his future will be excellent.