Not only is it difficult, it seems impossible. Mbappe was PSG's biggest trump card on the way to the championship every year by smashing the statistics. They lost this trump card and Mbappe will continue to work wonders in Real Madrid. Mbappe's absence will leave PSG in a very difficult situation. No matter who is replaced by Kylian Mbappe, he cannot perform like Mbappe.
So far, Mbappe has been a very important player for PSG in every victory they have get, even in some of the matches played by PSG so far, PSG has actually found it difficult to win without mbappe, so that indeed PSG dependence on Mbappe is very large and losing mbappe it will of course have the potential to make PSG weak, but we also cannot deny that other possibilities may also occur after Mbappe departure this season, maybe we will see PSG next season have a better game and also performance, because so far we cannot avoid if the contribution of other players to the team is actually closed by the prestige owned by Mbappe at PSG.
Many teams actually get better when their star leaves and make the stability of the team more balanced, making it easier for the coach to implement a game scheme that is considered better without having to have difficulties in maintaining the ego of a star player in their squad, in my opinion, losing Mbappe will indeed affect PSG's performance, but Enrique of course should have had a solution to overcome this and make PSG still able to compete in the Champions League.
Although Mbappé's move is already a fact, I saw that he was at Madrid and that now they have everything for him to be able to integrate into the team's ranks and although it doesn't seem to me that he's a suitable player for Madrid because I hope his ego is controlled and doesn't go too far, I think these things are good so that the strategies start to change, if it will be a great signing for an Ancelotti who likes to win games in a very close way, sometimes cardiac because the games we've seen sometimes wow as a fan almost make your heart beat out, then I think that with Mbappé if it goes well, then things will be different, of course, at PSG Luis Enrique has to make big adjustments and look for high level players, famous people and whatever, but I know that they want to maintain their status quo.