Dembele is also a great player, although Mbappe is much better known as a world striker. PSG also once had a number of world star players at the club, but they also failed to become champion candidates. Luis Enrique needs to build a better squad and must prioritize collectivity over individual skill and he needs to learn a lot from what Pep Guardiola did at Manchester City because their squad is also not strengthened by world star players.
City is a great club. But this season they seem to be having difficulties when their main players are injured. This can be seen from their last 5 matches when Haaland and Kevin De Bruyne suffered injuries. I'm afraid they won't be able to go further in the champions league this season. And for PSG I agree with what you said that they only have Mbappe as a world class striker although I also don't underestimate Dembele. But the problem at PSG is how Enrique makes collective team play because I see that currently they still only rely on one or two players in their game tactics.
I think if PSG were in the hands of a great coach like Pep Guardiola then PSG would really be unbeatable since last season. when there were still Messi and Neymar. But now only Mbappe is their mainstay in the squad and strangely I see teamwork at PSG getting better. And yes, I hope Luis Enrique can imitate what Pep did at Man City. But each coach does have a different character and strategy style. And actually being a coach in a squad that has many star players is not very easy. And in fact, PSG's previous coach, Christophe Galtier, must have felt this. Because being the coach of a club that has many star players definitely puts quite a lot of pressure on the coach. So it is not surprising that Christophe Galtier failed to become the coach that many PSG fans hoped for in the previous season.