I have never questioned the ability of Antonio conte any day, even when he had a terrible start as the manager of Napoli, I just know that if he is given the right players he can do what he knows how to do very well, which is winning the Italian Serie A, just as he did with Juventus.
Then as for their greatest rival Inter Milan, I believe that Inter who are the current champions of the league is actually going to be their greatest challenger, though the season is still very fresh, but I believe that by december, the picture will be much more clearer.
Conte is an experienced manager, he has proven himself in the past with several teams, including Chelsea in the Premier League. Conte came at the right time, although Napoli management did not fully support him in the transfer window, so far he has lifted Napoli from the slump. If Osimhen had been part of Napoli this season, Conte job would probably have been easier, but Lukaku has also done a good job.
Inter Milan, Juventus, AC Milan are teams that are very ready to be involved in the competition for the Scudetto this season. For now, because the standings have not yet been formed with a point difference the wide one, it is difficult to guess who will appear dominant by topping the standings in the future. Conte has more freedom this season because Napoli only play in domestic competitions, this will give them another advantage, where their closest competitors have a tight match schedule due to participating in European competitions.