PSG have sold enough players this season that they only signed Dembele from Barcelona. There were many other star players including Messi Neymar in PSG but in the new season we don't see any star player except Mbappe in this club. Last season PSG released defenders, released strikers but did not buy any players, maybe they will look to enrich their squad in the next transfer window. If the team plans for the next season, they will certainly give the utmost importance to every position from the team's defense to the strike.
The truth is that having that too much players was not doing PSG much good because one of the things I noticed about PSG that time when they have Lionel Messi, Neymar, Sergio Ramos, Mbappe and so many other player, was that it affected the performance of PSG because it was as if there was no much understanding between those players and that was the reason why they were having issues wining matches because of there over squad, if you watch PSG in those days you will observe what I'm saying but since they sold almost all those players that was when PSG were able to come back to there normal performance, so perhaps PSG doesn't need too much players but what they just need is few players that can add to there improvement.
Having much players didn't help them because at the time what they needed was much more than just these players been present in the team but then it's seemed at that point that the priority was placed on having the players with out much focus on the tactical force on the team, and other possible challenges the team may be having.
These players were jus too much and it seemed like there was conflict of personality amongst them because they were all big names and will all want to at some point show case their capacity on personal levels but sadly it wasn't helping the team because they had almost no proper communication amongst them on the pitch and Messi just left Barcelona for the first time and he was yet to adapt to football outside Spain so there were just too many factors to address if they were to win the UCL with that squad, and even till now they have still gat to work on the team spirit and cooperation amongst the players especially on the pitch.