Inter Milan will not have to do much for next season. Because, they have good players and good coaches. Juventus and AC Milan have plenty of work to do in the next transfer window, which Inter Milan will not. Juventus and AC Milan do not have moderately good players or coaches. Therefore, Inter Milan will show more next season than Juventus, AC Milan have shown this season.
I think they still have a lot to do, because will they want to be at the same level every season? whereas other clubs make changes that will make them improve, I think that would be very dangerous for them. And also do they only want to be able to compete in Serie A and not want to compete more fiercely in the Champions League? I think they really want to compete in the Champions League, and that will make them do a lot for next season.
This season they were only good when they were in Serie A, while in the Champions League they still struggled to provide anything good and they had to be eliminated in the knockout stages at that time. Obviously this is a very valuable lesson for them, because they were not that ready when they were in the Champions League. I understand that the Champions League is different, but they have to work even harder to achieve success in Europe's biggest competition.