Obviously, we both know it. but one thing we forget, that at the start of the season they seem very convincing. unfortunately, their performance has decreased along with issues of problems in the locker room and media reports that always corner PSG. until the time comes for PSG to be hit by various problems, whether it's Mbappe, Neymar and even Messi at the end of the season. made worse, several core players suffered injuries which ultimately resulted in a decrease in performance.
Referring to what you said, I can understand if Galtier lacks high flying hours managing a club as big as Paris Saint-Germain. maybe also, what you say is true that Galtier doesn't have the experience to handle big stars yet. Besides that, there are many other factors based on my point of view. and I think, I often describe it in several posts.
regarding coaches, as far as I know for now, only Julian Nagelsmann is a strong candidate to become PSG coach. in fact, I'm pretty sure he will give it his all if he does eventually come to the Parc des Princes. in fact, I would agree even more if Nagelsmann overhauled the existing line-up of players. That way, he will be free with what he wants. by the way Jose Mourinho, last I read the rumours. that PSG are no longer interested in him after losing in the Europa League. well, I'm curious, which coach will handle PSG. so, let's wait.
We know they are going to hire a new coach but still, all we hear is just some names like Mourinho and Zidane and I think Zidane has much more chance to work in PSG for the next season.
If PSG have changed their mind about Mourinho then Nagelsmann might be the one to take over. People want to see Zidane managing PSG very much but I don't feel like this will happen. Because there isn't even a rumour I have heard of in the recent times. It looks like Zidane is still not keen on managing a team other than a national team he would like. If he signed for PSG now I would have nearly zero doubt left about PSG's future. Despite the solid players leaving the team one by one I would still believe in him to find a way.
By the way I have also heard about Luis Enrique rumour. If we compare him to Nagelsmann he has a more impressive career surely.