Many things have happened in Serie A this season, Napoli, who are defending champions, have had poor performances so they cannot compete again to defend the title. And there are several teams that can show improvement, including Inter Milan, which has been successful this season.
If we look at the bottom of the standings, there is still competition there, because there is still competition to stay in Serie A next season. There are at least 3 teams that are still not safe until this last week.