After being eliminated from the UCL and focusing on improving their standings, they should have been able to get more win, but what happened was that after they were eliminated, they actually made the game worse with lost of confidence and mentality until they had to suffer 3 consecutive lost and all three were lost with the same score, namely 2 - 1, this was narrow lost but even AC Milan could not try to make it draw and share points.
Being able to participate in the European Conference League is already good thing, haha team like AC Milan is really in trouble now and cannot compete competitively.
AC Milan even has the potential to not enter the Europa Conference League next season if their own performance conditions are still like they are now. Because AC Milan needs to fix many things and many lines to be able to restore their true strength next season so for this season I don't think there is any need to expect AC Milan to be a participant in any League other than being a participant in Serie A. Now Milan is near Udinese which is a very sacred position for a team like Milan and other teams also know that Milan is not doing well this season.
When they were eliminated from the champions league of course we all thought they would put all their ability and focus in the domestic league, but unfortunately it turns out that their focus precisely not supported by the ability they have to do so, currently the change of coach has not even had a positive impact on Milan and I think the problems they face at the moment are very complex, not only from the performance and consistency but the game strategy and also their mentality also looks very bad in the league, currently they are ranked 9th with a difference of 6 points from the conference league zone, although actually they still have a chance, but with all their problems and also the tight competition happen is indeed very difficult for Milan to qualify for European competition next season.
Even when Feyenoord knocked them out of the championship league, it was a big disappointment for them, but still, they were still playing a poor performance in the domestic league, if not even AS Roma, that we all are thinking their performance is out of point, are still better than AC Milan. It's not encouraging at all, and which is just as you mentioned, if they will not put more effort and be consistent, it will be very hard for AC Milan to qualify for European competition next season, but we don’t know if they will be able to perform better, but if it's based on this performance, then I don’t think they will be able to make it.