The President of PSG still has quite the ambition to win the UCL title, especially since Mbappe left, the fighting power of PSG's front line will be reduced quite drastically, currently PSG is reportedly targeting Rashford, Leao, Osimhen but none of them have been officially announced, it seems this is still a challenge It's tough for PSG, they have to immediately bring in players who can replace Mbappe before the league starts.
Maybe they could bd a better team without Mbappe. It’s most unlikely they get another individual player better than Mbappe but possibly because he’s so good they relied on him too much and other players chose to pass to him rather than trusting their own skills to create something.
Perhaps replacing one world class player with three very good ones, the level below could improve them as a team. We will find out any way.