I would also still favor Napoli. Inter are likely to compete, but as you say, the new coach must manage the available players well. If all goes well, maybe Inter can appear stable in the competition with Napoli.
For other teams, I hope Milan can show improvement, as well as Juventus and Atalanta, who hopefully can perform better in the competition of the new season.
Teams like Fiorentina and Lazio also used to perform well at the beginning of the season. But eventually they lost focus and were no longer consistent in the middle of the season.
I think Alegre is capable of bringing Milan back into the title race, in fact, the team is fine, they just lacked competent management, and I want to believe that they will give Alegre enough time so that he can restore order in the team. Inter without Inzaghi will have a hard time competing with Napoli, and I also have doubts about Juventus, because they need to strengthen the attack, without this they will still only fight for the top 4. It is important for Milan to start this season well, and I think they have a good team for this.