I believe Juventus will be able to improve their performance much more by the coming season. They started to perform better especially after they signed Vlahovic. He made their attacking line stronger than before.
Too early to judge they will improve their performance. The problem in Juventus isn't only about the attacking line, but they also have problems in both midfield and defend lines. So, the problem is quite complicated. Another problem, the players have no good mentality as the winning team anymore. The coach must fix this if Juventus wants to improve their performance in the next season.
Juventus has certainly lost their dominance in the Italian league. Now they are not the best team but they still are one of the better without any doubt. The problem is that Juventus is not handling their players well. They have made some good transfers but they have turned out to be a little questionable over time. Recently the decision of letting Dybala go is also not a popular one. And obviously, I agree that the defense and midfield are also not one of the best. They need to make changes in the squad. At least at a level so that they will be able to compete with the current better teams in the league like Inter and Milan.