The improvement of AC Milan in the last 5 years was nice and I believe that they can be maintaining some consistent winning if they could improve more on both the defence and attack. They can learn from Napoli, what made them win this season is not majorly about the strength of the whole team which was later obvious towards the end of the season, but the firepower of their aggressors, especially Victor Osimhen. I believe that AC Milan will always be a good force to fear in Serie A in the coming years, nonetheless, a few more adjustments and determination by the players can go a long way.
all depends on the strategy owned by Milan to remain the strongest in the summer. I mean you said about the strength of AC Milan's defense and attack line even now Milan seems to have financial constraints to buy several new players.
even though Milan themselves need new players to strengthen their performance in the summer and it is not easy to have to compete with Napoli or even have to win the Champions League or European League trophies without new players who are stronger than before.
but Milan still has that hope to be stronger in the new season.