PSG have strengthened their attack. They have recruited three of the best players in the world like Messi, Neymar and Mbappe. But they didn't strengthen their midfield enough. If the midfield is not strong then only strong forwards cannot be expected to perform well. The forwards' bond with the midfield is strong, but the team's overall performance is good.
At the same time, I will say that PSG's squad has a lot of tactical problems. Even their coach is yet to find a stable formation for the team. How will the team play well if the match strategy is weak?
PSG should first coach the team with someone who has experience on the Champions League platform. And giving him complete freedom to form the team. Since PSG has no problem giving a big fund. So it is expected that the team will be stronger if there is an experienced coach.
I think judging what you say that I also agree and the only coach who can make them win the Champions League for me is Carlo Ancelotti.He has done well in every team he has managed,even in CSKA Moscow for a bit of time when he was training there and brought them on the Champions League several occasions.I think this coach can do wonders with a team like Paris and their superstar players,I am sure the experience he has would come in great help to Paris in trying to win the Champions League.For this to happen though Paris should pay him a huge amount of money so that he can accept the job and bring Paris to new levels in International competitions.
As @LitteBitFunny put it, the conclusion is what he said. in fact, PSG has 3 very deadly attackers when in the opponent's defense. yes, as we know that the MNM Trio are three stars that have their own advantages. it's just that they don't have midfielders who are more creative when helping attacks, as for the several players available. so far, what they have shown is not enough to help the front lines when building attacks. the defensive midfielders are no exception, sometimes they are inconsistent which has a bad impact on PSG's defense.
Well, currently there are many rumors circulating regarding the departure of some of their star names. but on the other hand, PSG will bring in several replacements plus a midfielder who has talent. speaking of coaches, I would not say that Galtier is a bad coach. it's just, he doesn't have a good system. I don't know what was the obstacle for him, but he failed to bring PSG to the Champions League. So, his career is on the edge. as for the replacement name, if PSG are coached by Nagelsmann, it looks like it will be more interesting. I am quite optimistic, if Nagelsmann is able to bring PSG much better.