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.
So far, PSG do not have everything they need, first they need some good strikers, because since the departure of Messi and Neymar they have not replaced them with anyone, and now Mbappe has left and the lack of quality players in the attacking line will be too noticeable for anyone teams, and especially for the one that wants to win the Champions League. It may take many years for PSG to win the Champions League, and this may happen without Enrique, because the PSG management is not as patient in practice as in words.