PSG still have reliable players that they can train to get a better start next season, but the problem is that the way they train reliable players must be clear so that the team can get good results in the Champions League. Because PSG still haven't tasted the sweetness of winning the Champions League, and that should still be their target next season by implementing a different strategy than before. Especially if PSG still has a lot of money to get more reliable players and coaches for the team.
Even if money buys everything that makes sense, it will never guarantee that PSG can win the Champions League title that easily. PSG must build a squad with the best mentality and quality, but so far PSG have not been able to do that.
They have to learn from how Manchester City built their squad and mentality, so even if they spend a lot of money it will be worth it. Hiring a quality manager for many seasons like Luis Enrique can make them have the possibility of reaching the Champions League final or even winning it, but PSG tend to switch coaches easily when they fail in the Champions League.