You're right wins like this will help to boast the confidence of teams so for AC Milan this first win will be helpful going forward they should build on this win and maintain this form
Their performance must be better than it has been so far, as AC Milan will also face more matches against teams of significantly different strengths. Therefore, Milan still needs to improve their abilities to be better than they already are, even though they won away at Lecce. If the Milan players can maintain their positive spirit, perhaps Milan can make a difference again when they host Bologna in their next match. But for now, Milan must not stop improving, as their overall strengths are still not that strong.
At the very least, this victory is crucial for boosting the mentality and confidence of the AC Milan players as they look ahead to the next match.
Honestly, I don't think AC Milan's full strength this season has been fully revealed. After making many changes, I think there will be significant changes compared to last season. It's just a matter of time before we can see that, as everything takes time, and they are going through that process.
AC Milan's next match against Bologna won't be easy, but I still have a lot of faith in AC Milan. They will certainly improve and become even better.