I agree with you
I don't know this player very much, but he looks good and certainly can give a lot of help to the team, which suffered a lot in the previous season
I'm not saying that he solves everything, but he certainly gives a hand
I need other players in my opinion (also in defense)
Well, I can tell you that Di Maria is a player of great quality. He has helped Real Madrid win a number of titles, he has also helped PSG win titles, so I think he can also help Juventus achieve the same feat at the end of the season, but of course Di Maria cannot do it alone.
Di Maria's quality and experience can help Juventus win the Scudetto again, but as you said, Di Maria cannot do it alone without the support of other players. After the midfield problems were resolved, Juventus also had to improve their defense and attack power. The main problem is that the Juventus defense is still very fragile, Juventus must move quickly to find a replacement for Chiellini who left Juventus at the end of last season.