While I agree that PSG doesn't normally aim ligue one because they know that they can get that, and mostly aim UCL and they are looking to get that, I can say that it's clear we are going to end up with them not getting it this year, so they may consider this year as development season maybe? If they keep on rushing to get some players, they will spend way too much money way too quickly and that could lead to making mistakes, but if they take a few more seasons to adjust, then they could make sure that they have all the right players in the team for a chance to get UCL as well.
I feel like in a few seasons Peps contract will end, and he has talked about leaving City before, maybe they could try to get him since he would be a great manager for them.
Paris Saint Germaine already have a fantastic squad that can compete in the biggest competitions and that's why I totally concur with your opinion. Rushing to sign players in other to further boost the team's quality, depth and strength doesn't translate to having a great campaign come next season so like you rightly said, I think it'll be be a good idea to allow the club manager to build the team with the available players at the club. I strongly believe that Paris Saint Germaine under Luis Enrique will succeed because of his wealth of football knowledge so if I'm to advise the club management, I'll suggest they allow the Spanish manager do things his own ways.