PSG surprises everyone in the just concluded UEFA Champions League competition, and they can compete in the next UEFA Champions League competition that will start in a few months from now, but I doubt if PSG can make it to the final because the UEFA Champions League is a tough and difficult competition, and a lot of clubs will rise against PSG when the competition starts.
PSG is still competent enough to compete for UCL. There are two main materials needed in order to create a recipe how to win UCL. You need unlimited money, then combine it with a proper coach. It doesn't matter how competitive UCL. As long as they have this, they can win UCL again.
The history has told us about almost all of clubs were ever winning UCL came from the rich clubs. You can't deny this as it's also recorded in Wikipedia.

Kinda weird when you're doubting PSG's competence to compete for the next season.
Nobody is doubting PSG competence to the finals, and it's not because they are rich means that they will make it to the finals. We have other rich clubs that have the same resources like PSG which makes it difficult for one to conclude that PSG will be in the finals next season. I learn and say things based on my past experience and funny enough, people forgets that changes is always constant. Check out from four seasons back till date, no club has won it back to back and whenever any club wins the league, people will always say that same club would win it the next season but football do prove them wrong. What work for you this season might not work for you next season.