I think Inter Milan will not be able to maintain the Scudetto next season, this is because Inter Milan is currently in the midst of a financial crisis, forcing Inter Milan management to take extreme steps, one of which is sacking Antonio Conte as their coach and replacing him with Simone Inzaghi who is relatively inexperienced and has a low salary compared to Conte likewise, Inter Milan move that they plan to sell some of their core players to other clubs makes me believe that Inter Milan will not be able to win the Scudetto next season and maybe Inter Milan will even be knocked out of the top 4.
Inter Milan will have to prevent their star players move out of the club in the transfer season, during and after the Euro 2020. If they lose 2 or 3 star players, I am sure they will be challenged by Napoli, Atalanta, AS Roma for a position in top 4.
Simeone Inzaghi is not a bad coach but still lack of experience at 1st and 2nd position on the table as well as manages resources for multiple tournaments: Serie A, Champions League, Coppa Italia. This new season will be a big test for him and Inter Milan might be affected as well.
I think Juventus will win the Scudetto again next season and the runner-up position will belong to AC Milan, which this season has a fairly capable squad.
Juventus has a good change with Max return and Ronaldo will not leave the club from what we've witnessed so far. They can fight with AC Milan for the Scudetto but it is not their priority that is Champions League. The general age of their squad will be a problem if they decentralize their sources for Serie A and Champions League.