Napoli didn't play any European competitions last year and had a very advantageous fixture schedule. Inter, on the other hand, had reached the Champions League final and looked like a team that, with its tired players, struggled to qualify for both tournaments. The disappointing thing for Inter was their loss in the finals. They emerged from a very demanding fixture list but failed to win either the Italian league or the Champions League. As for Napoli, I don't know what they'll be able to do in these two grueling fixtures next year. I think their chances of winning the title are lower than last year.
Napoli will have to focus on the new season because this time, Napoli will have a more congested schedule. And perhaps their chances will be a little more difficult. Last season, Antonio Conte was able to focus his strategy solely on Serie A. However, this time, he will have to think twice because he also has to consider the stamina of his players to prevent fatigue amidst the heavier match schedule.
However, if Napoli remains more focused on Serie A, their chances will still be strong. But I doubt Napoli will focus solely on Serie A because I'm sure Napoli wants to carve their name as champions in the upcoming UCL. So, Napoli's goal is definitely glory in the upcoming UCL. But I doubt they will win the UCL. But I don't doubt them for Serie A.