Mbappe is a special player. And no one can fill the absence. Mbappe is a much improved player. He is physically and mentally very skilled, strong and he is a successful player. No other player can fill Mbappe's absence. Change is good at PSG. Even though Mbappe is not at PSG, he pushes his team to play well and do something new. One of Enrique's most notable strengths is - he is very nice and fair, efficient in managing PSG's players.
The important change that PSG must make next season is the strength to reach the final in the Champions League and also try to get their first Champions League trophy next season. Because if they are only too busy with the Ligue 1 trophy, I think PSG will still be considered an ordinary team and not better than other teams that have won the trophy. Mbappe's departure to Real Madrid could indeed be a very hard blow for PSG, but that is not the only reason for PSG to remain strong with their other players next season.
Winning the Champions League trophy was the main goal for Paris Saint Germain. But even with Messi, Neymar and Mbappe in this team, they couldn't do it. I think it's impossible for them to do it next season. They will undoubtedly continue to dominate the French Ligue 1. They still have quality players like Hakimi, Dembele and Vitina. They are the number one favorites for the title in the French Ligue 1. But I can't give them a chance for the Champions League. I don't think they have the squad to do it. But I would like to say that Luis Enrique is doing good things to create a good team there.