I feel the problem PSG have is mostly because of the bad management they have.
PSG got enough money and they had good players too also they had enough investment in their team to even hire better players, but the fact about this team is they need to have a good management team to keep the players in line which is not something PSG has.
That's why I think even if they hire better players still nothing will change for them.
Last season PSG had a complete and quite perfect squad if we look at it but their final result failed in the Champions league. I think it's not only bad management but also very bad psg fans where they make fun of messi because they think that messi failed to bring psg to the final in the Champions league even though they don't need to do that.
For next season I think that both the management and the manager in coaching must be able to align all the players to stay the same or nothing needs to be special because they are a team not a person.
Even this season management has fired Galtier and they are trying to persuade Zidane and most likely I believe their dreams will not come true.
These days I see news about Zidane linked to Real Madrid and PSG while both teams still have coaches, I think if they fight for Zidane for the next season PSg can have more chance because of the more money they can pay.
Maybe Zidane can make some changes and finally help PSG in the champions league.