Having many star players in a team sometimes does not always have a good impact, the proof is when PSG still has several star players such as Kylian Mbappe, Neymar Jr, Lionel Messi and Sergio Ramos but they still can't realize their dream of winning the Champions League title they are only able to win the domestic title when they have spent a lot of money so the presence of star players is not something that can be proud of by the club if the club cannot maximize its performance, precisely with high solidarity and good cooperation even without star players the club can perform as well as possible because they have the motivation to work together to realize their dreams not be selfish to be able to get individual titles only.
If people ask why PSG didn't win Champions League because they have Mbappe, Neymar, Messi and Ramos, I would say why they will beat beat Real Madrid when they have Courtois, Rudiger, Nancho, Carvajal, Rudiger, Militao, Modric, Valverde, Bellingham, Benzema, Vinicius and Rodrygo? 4 players can't beat 11 players.
PSG is only have few star players, while Real Madrid have eleven star players.
But still, having many star players does not guarantee the team to get the trophy easily but at least, if it is associated with Real Madrid then of course the results are still possible as expected. Also, when PSG had Messi and Neymar at that time, basically it was not only about the four players you mentioned because basically PSG had star players in almost all positions from goalkeepers to strikers.
Therefore, basically PSG also has star players in almost all positions but still PSG failed. Therefore, above I said if it is related to Real Madrid about many star players, then it cannot be equated with other teams that also have many star players. Because after all, Real Madrid has been successful for a long time with many star players in its squad, while other teams can be said to be just starting out and therefore other teams that have many star players still find it difficult to get the most prestigious trophy in Europe, unlike Real Madrid who continues to succeed with many star players in its squad.