Luis Enrique will do the necessary changes to boost the performance of the club.
Now if you want to see how Luis Enrique can handle this, for me it is everything this coach has always wanted, he already did it once with the Spanish national team, for me things have to be much more delicate because everything is in his hands how he wants to form his team, now the gap that Mbappé leaves is not just anything, the formation, strategy and everything of PSG changes, now he has to adapt to a style of football that is good, even becoming the best and quickly, so the truth is that Luis Enrique's challenge is not very easy, because the responsibility he Carries on his back is not just anything.
Enrique must be able to bring PSG even better next season even though they no longer have Mbappe in the squad, Enrique is a very experienced coach and we can even see his achievements when he previously him coached Spain and Barcelona, but even so, Enrique must get full support from PSG is currently completely overhauling their squad in order to be able to compete in the Champions League next season, I think PSG main goal at the moment is only the Champions League and Enrique certainly has everything he needs to be able to give PSG that the trophy next season, I think PSG will continue to support Enrique with quite a large amount of funds in order to be able to bring in lots of good players, but if he only succeeds in winning the Ligue 1 trophy next season but fails to win the Champions League then it is certain that he will be fired.
Losing Mbappe shouldn't make PSG lose strength as a team, although perhaps Mbappe's departure will leave a little gap, but I don't think it's difficult for PSG to close that gap if they can bring in another striker next season, currently Enrique has entered his final year with PSG as coach, so he should be able to maximize the PSG squad next season to be able to win the Champions League trophy, so it is very likely that PSG will give him a new contract as their coach.
Personally, I'm of the opinion that anyone who actually do think that Luis Enrique will not further improve the performance of Paris Saint Germaine either doesn't know much about the Spanish manager or some kind of hater of Enrique. For people who know Luis Enrique right from his days at Barcelona where he helped the club win the treble in one season, I don't they'll ever doubt his ability to deliver with any team he manages. Though his stint with the Spain national team didn't actually produce great results, I'm very optimistic that he'll do well with the current squad in his new club.
The departure of Kylian Mbappe will without doubt affect the performance of the club because of how big of a figure he was at the club but I think Enrique will definitely find solution to that. Paris Saint Germaine is yet to make any significant signing to replace Kylian Mbappe but I think they'll definitely do that before the end of the summer transfer window. A lot players have been linked to the club but none of them is confirmed yet. I believe in Luis Enrique and his capabilities and hopefully, he's not gonna fail.