Of course, congratulations are needed for Milan. But I think Milan's main goal right now is the championship in European cups. For a long time they did not achieve great European success. If they do not distribute their squad next year and make good transfers, they will have successful matches in the champions league in Europe. Whether they will be favorites for the cup depends on this transfer season.
Let's see how they will play in the Champions League next season, because this one was probably one of the worst. Milan are champions in Serie A, this is a great result, congratulations! Ibrahimovic has previously stated that he would end his career as a footballer if he wins at least one trophy with Milan this season, but I don't see that him saying that his career is over. It can be seen how hi loves football and does not want to agree that his time as a player is already over.