I agree that things don't look like they will be easy even for Allegri. Because we know that AC Milan will not spend large amounts of money to transfer players like the big teams from Laliga and the Premier League. However, we know that teams from Serie A are teams that are always able to bring in players who are not that expensive but of high quality, and sometimes they can increase the transfer value of players who are originally cheap to very high. So I hope Allegri is lucky with AC Milan next season. And yes, he has to think hard to find players who fit his criteria to revive AC Milan.
By the way Inter milan has lost in the UCL Final with a big score of 5-0. With this, none of the Italian teams managed to get a trophy from European competition this season.
Of course it will not be an easy task for Massimiliano Allegri at AC Milan. Even though he was successful at AC Milan in the past, AC Milan's current condition is slightly different from AC Milan in the past. So Massimiliano Allegri definitely has to make re-adaptations to this team. And Massimiliano Allegri will also definitely need new players who will better suit his coaching style. So it is certain that several players will definitely be released in the transfer market to bring in other new players who suit Massimiliano Allegri's wishes.
But one thing that will benefit or make things easier for Allegri when coaching AC Milan in the next season is that AC Milan will only focus on the domestic league. Because AC Milan failed to get tickets to European competitions for next season. So focusing on the goal of winning the Serie A title seems very possible for Allegri.