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.