I don't really understand Napoli, even though many clubs want Osimhen, Napoli doesn't seem to want to sell him because they deliberately set a very high price so that many clubs don't want to buy him. And it's true as you said if it continues like this, it is not impossible that the price will continue to fall. Even though on the one hand Conte is not trying to keep him because he prefers Lukaku.
Of course, if there is still tension within the club, it will be difficult for the club to rise, because the tension between the coach and the players or with the club management will greatly affect the dressing room so that it will affect the team's performance. This was very clear in the first match against Verona, even though in this match Napoli was very superior and in terms of player material Napoli was also superior but they lost badly to Verona. I believe that if this transfer is not completed immediately, Napoli's performance will not improve.
Actually, Napoli currently has another opportunity to sell Osimhen. because according to the news circulating, Arsenal is ready to bring in Osimhen with an offer close to the new price, which is € 100 million plus bonuses. This offer also shows that Arsenal is serious about bringing in Osimhen to strengthen Arsenal's front line in the hunt for the EPL trophy.
That's right, Osimhen market value could drop if Napoli still doesn't want to release their striker, because there is no guarantee that his performance will continue to be sharp next season under Conte control. In addition, something that Napoli management needs to pay attention to is Osimhen departure for free, like Mbappe leaving PSG, this could happen if De Laurentiis insists on setting a high price. Arsenal seems to be showing more serious interest than PSG, where they really need a capable striker to be able to compete with Manchester City in the Premier League, Osimhen can be a more important player than Gabriel Jesus and Nketiah if he is willing to move to the Emirates. In addition, Napoli unstable performance in the first week was the impact of chaos within the team, because their transfer plans had not been fully completed, Conte still hoped to bring in Lukaku and several other players by relying on the profits from Osimhen transfer.