Luis Enrique is the person who is expected to be able to make Paris Saint Germain even better, even though several players who have been very important at Paris Saint Germain have left. However, this cannot be an excuse for a coach, because they are expected to be able to do it with the players in the squad, it just remains how the coach can see every potential in the players and can make these players show their best abilities.
I think at the moment they are definitely making a personal approach with some of the players they want to bring in. We don't need to talk about money, because with their current finances they are very capable of paying the players they want. We remember when they had to pay 3 star players at once, that wasn't a problem for them. As for who the players they will bring in is still a question mark, because the names of several players that have surfaced at the moment are still just rumors.
For this season only Mbappe is leaving and although this could have a bigger impact, it could be a good thing for Enrique to manage PSG the way he wants to do.
Mbappe is indeed the backbone of PSG until this season ends but the level of ego and authority given to Mbappe from PSG makes him difficult to control which makes his treatment different from other players. So with him gone it is clear that now no one is differentiated in terms of position by the club and competition will become healthier.
Although it cannot be denied that the possibility of his performance will experience problems, especially when talking about the Champions League, this transition can be a positive thing in the end for PSG in the future.