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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.
Luis Enrique is a very experienced coach. And in the past seasons, PSG management has never had an experienced coach like Luis Enrique. This is why we have high expectations for Luis Enrique. I am not a fan of Luis Enrique. But we have to admit that he is a very experienced coach. Also, I know PSG doesn't have any big star players in their squad right now. But PSG have plenty of money. If Luis Enrique can stabilize the squad then the PSG management might try their best to add Luis Enrique's preferred star players to the squad.
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.
You are right that players need to be confident and experienced to win the Champions League title. Even for PSG's current squad, dominating Ligue 1 is no easy task. However, since they have got an experienced coach. Luis Enrique may be able to boost the confidence of the players. But it is definitely time consuming. It's unlikely to happen anytime soon.
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.
I know Mbappe was the main scorer in PSG's squad. And so far PSG have been unable to find a suitable replacement for Mbappe. PSG management will likely add Osimhen to their squad as a replacement for Mbappe. Osimhen has the ability to score a lot of goals. Mbappe's worthy replacement may be Osimhen.