Milan is just a bad team in the first place, they have Gimenez, Felix and Walker, their performance aren't that bad actually, they can still perform. Bologna's squad is a combination of young players who not able to reach senior team, second tier players and old players who no longer playing in senior team, yet Milan still lose.
Better to sack the manager instead, maybe Italian teams good when they get managed by Italian managers too. Inter, Atalanta, Napoli, and Juventus are managed by Italian managers. Milan was better when Stefano Pioli was the manager.
AC Milan With its current coach, Sergio Conceição, it is not as good as you have said that the appearance at the beginning of the season was not so good and like a wind in the game, it was also not good in giving tactics, even though it has players like Gimenez, Felix, and Walker, if it is not handled properly, then the results we can see for ourselves AC Milan, they are still stuck in 8th position in the standings and their last two defeats were really disappointing, of course there must be a revision in the squad and management that is so lacking in paying attention to the shortcomings in AC Milan's playing style this season.