I think Luis Enrique is now preparing his squad to win the Champions League title. Like Guardiola, Luis Enrique is planning for the long term. PSG have a lot of talented young players in their squad. There is no doubt that the PSG team will get excellent performances from these players in the future if properly groomed.
Moreover, PSG management is very rich and they are ready to spend money to strengthen the squad. Luis Enrique will get big funds to build his squad with the players he wants. This season he might try to stabilize the overall squad. And will form the squad targeting the Champions League title next season.
Of course, UCL has always been PSG's target since long ago. However, are you sure that Luis Enrique can really prepare a squad to be able to really compete in UCL and become the winner of UCL? Because even though Luis Enrique's target is for the long term, some of the names of these young players are not top players who can be said to be very impressive. While other clubs also always prepare their squads optimally, both with young and old players. So that other teams will be also more competitive from time to time.
To win the UCL league is also not only related to the strength of the quality of the team squad but also the mentality. What I have seen from the past, PSG still lacks a champion mentality in its UCL, even when they still have a complete squad with top world players, such as Messi, Mbappe, and Neymar in the club. So, Luis Enrique's homework is quite a lot for PSG not only to prepare its squad but also a more solid and stable team mentality.
Honestly, I don't understand why you are so confident to say Luis Enrique targeting UCL trophy. You must know Mbappe is their main machine goal, he just left the club and PSG still can't find a proper replacement for Mbappe. In this matter, PSG is probably a more difficult to compete in both domestic and international competitions. Moreover UCL is the highest level of football competition, it should be harder to compete with the current squad of PSG.