Regarding Napoli, I don't think they can win any trophies this season because it is very certain that they will be unable to do so. Last season, Napoli was the favourite team in the serie A league, but this season, they really let people down with their play; they are the team that didn't sell out many players and even their best players don't look good. Napoli is currently in ninth place in the league table, so it is not even safe to say that they will be in the Europa League.
Napoli is like a club that has run out of gas in the race, there is no longer any talk of linking them to defending the Scudetto this season. In fact, their current position is very dire, although it's not too bad, in my opinion, Napoli doesn't deserve to be ranked 9th on the standings. We can imagine how the performance of Walter Mazzarri team has fallen at the moment. It crossed my mind that De Laurentiis will likely be looking for a new coach again to save Napoli from falling even worse.
Regardless of who will win the Scudetto at the end of the season, Inter, Juventus and Milan are believed to be able to secure tickets to the UCL next season. Several teams including Napoli will compete for one more ticket, their chances of finishing in the top four of the standings are still quite open. Mazzarri must be able to manage Osimhen and Kvaratskhelia properly like Spalletti did, if these two players can perform at their best then Napoli has the opportunity to finish in the UCL zone.