It can't be that simple in my opinion, although indeed this season is very disappointing and last season Napoli was very stunning it is indeed very difficult to express, but yes how else can Napoli not maintain and get players that make it difficult for them to maintain their position at the top of the standings, it can be considered that last season they were very lucky where the state of other big teams regressed.
what you say is not entirely wrong, in fact the players are more or less the same, the team is more or less the same
luck was certainly a determining factor, always
this season what weighed heavily was total self-distrust and not believing in oneself.
this certainly had an influence and exceptional players like Osimhen were not able to shine as much as they could have
yes we see that Napoli is like helpless this season, 90% of the brand has the same players as last year, it's silly to blame players leaving or whatever, Napoli can't compete this season, I don't know why, I don't know the problem because the decline is very significant, Yes you are right Osimhen who was in the race last season became worthless because the team's performance decreased and made him also not much well developed, whereas if he took the opportunity to get a better team maybe he would get more beautiful sunshine, but maybe because of the confidence that Napoli also entered the champions league to change his fate more seems not as expected.
However of course the priority was to win the Serie A title and they did it like a boss. 
It was a full domination during the all season.
Because he is always the one to be linked the most. I would expect the same especially after this huge effort. 
