In my opinion, PSG's initial plan to bring in Messi, Neymar and Mbappe was only to increase the big names in League 1 to become more popular and the second plan to achieve success in the Champions League all ended badly.
Why do I say it ended badly?
Yes, because after bringing in several star players, PSG has always depended on these star players, like most recently Mbappe has left but PSG still hopes that he can stay because he is one of the most reliable players and he can always make the biggest contribution.
Mbappe's mistake should have been that when they still had Messi, Neymar and Mbappe, PSG should have thought about the long term in bringing in young players and given the opportunity to appear with these star players so that the young players could gain experience from star players which could improve the talents of these young players.
It would be a shame if PSG never thought about this and thought more about continuing to bring in experienced players at high prices without thinking about the future of the club like now after losing star players, PSG does not have the next generation for Mbappe.
Star players alone cannot bring PSG to the highest level of the UCL, Messi, Neymar and Mbappe have their own egos and want to be superior to others so it is not clear why PSG failed at that time. Now PSG management is starting to learn that what they need is not just star players, but a history of struggle. This means that PSG in League 1 is used to lifting trophies, but in the UCL competition it is just an ordinary club because PSG does not have stability. This season there is only Mbappe in the UCL and the results are not too bad, meaning that basically PSG must be able to create a stable squad. Now Mbappe departure will leave a lot of work to do, without a pure striker replacement then I'm not sure next season in the UCL we can go any further.