PSG already got what they needed to have. In the last season, they had superstar players but they didn't have a coach like Enrique in this team to help players have better teamwork and they have it. Also, Enrique is experienced enough to make PSgeven win the Champions League title.
But other than this, they have to give Enrique some more time and provide him the players he needs, Mbappe leaving PSG was harmful for them.
Enrique's own abilities are indeed quite good in terms of coaching a team like PSG, but winning the Champions League will always be a very tough challenge as long as Real Madrid can continue to dominate the League. Apart from that, the players in the PSG squad itself also still have an influence on the entire team because when any team plays in the Champions League, the strength of their respective players must really be there with a very good level of talent. And PSG hasn't had that in recent years.
I agree that it is going to take a while for them to get better, it will not be too simple and it will take a while. Winning UCL is a very difficult task, while some teams may win it when you do not even expect it, some teams like City who dominate a tough league like premier league could have hard time getting even just one. This is why I think it is not easy for PSG to win it, but when you least expect it then they may win it too, you never know.
I believe that this season isn't it though, they lost Mbappe just recently, it will take time for them to adjust playing without him, and it is going to be hard for them to get this new team to win something major. If you ask me, even ligue one is in danger right now as well.