From now on PSG have to count on themselves and try finding a player that could replace Kylian Mbappe so they can keep dominating Ligue 1. For Champions League, they have to build a better squad.. they will regret not winning it this year after all what happened.
Zague is still young and he has to adapt with the team. Dembele in the other hand has to pop up quickly and recover since his mission become heavier in PSG.
In fact, releasing it now for free is clearly a loss that should be minimized. But indeed this is also quite good for learning so that in the end in the next season when there is a player who has the type and performance like Mbappe, PSG will not make the same mistakes.
Currently several players are starting to be linked with PSG as a replacement for Mbappe but there is still no one who is truly believed to be the successor to PSG's backbone.
I think Osimhen is still a pretty good candidate, but if you really want to look for a player who is a runner and relies on dribbling then the rumors about Rashford are actually not too excessive in my opinion.