I think PSG squad is already very solid to compete in this year Champions League so there is no need for them to bring in other expensive quality players into the team because it could damage what has been established so far, but if they want to add players Luis Enrique should focus on a solid reserve goalkeeper or defensive midfielder just to rotate the core players so that the balance is maintained.
The change in philosophy made by Enrique made a significant difference for PSG because for now they do not want to repeat the mistake with their money where previously they were always focused on creating galacticos in Ligue 1 but for now Enrique has taken a stance by changing to utilizing young players for longer-term goals.

This provides a pretty good boost in the end because the season that has ended has become a result that was not even predicted before, especially for the trophy in the Champions League.
This shows good progress but for now they are still required to give their best because no matter what for now PSG will clearly be one of the clubs with a strong probability of also winning the new season in the Champions League, especially for now their status is the defending champion. This is a new challenge for Enrique because in any case with the current situation they will be more required to continue to provide good performance and when PSG cannot realize this then their condition will be a little different because any gap will definitely trigger a wave of criticism in the end.