Yeah Osimhen prefers to stay and extend his contract with Napoli this means that Osimhen cannot make a decision in the next few seasons, unless Napoli wants Osimhen released, as you said, Osimhen's performance has not been optimal this season so his interest and market value will definitely decrease so there is a possibility that we will see Osimhen play longer in Serie A. This season Osimhen only scored 12 goals and this is proof that its performance is declining but Osimhen is still young he still has a chance to improve his performance next season.
Osimhen has not reached an agreement with PSG, but he has previously said that he has decided to change club, so perhaps he just wants to achieve better contract terms. This season he is not as good as during Spalletti's time, but this player has great potential, this only means that Enrique may not get the expected result from him, and to be honest, it seems to me that PSG, with their financial capabilities, can find best strikers.