Juventus is indeed a tough competitor for Inter Milan this season to win the Serie A title, Napoli themselves are much different from last season after changing coaches and will certainly not be able to defend the Serie A title this season. In fact, I think Napoli will have difficulty reaching the top five positions, because from 10th to 4th place, the points are very close to each other so the competition will be even tighter.
Moreover, in the next match Napoli will visit Lazio's headquarters, it will certainly be a tough match and it is possible that they will lose points again because so far Napoli have not found their best game. Of their last four matches in Serie A they were only able to win once, draw once, lose twice.
I think Napoli's chances of being able to compete on the bag board are very small because their performance is quite bad at the moment.
However, when it comes to winning the Scudetto, I don't think it's just Juventus and Inter Milan because the AC Milan team is also worth considering now.
There are still quite a lot of matches remaining for this season, it's possible for anything to happen and we don't know which team will be able to maintain consistency. Of course, over the course of a long season there will be teams that go up and down in maintaining their performance.