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.
It was no longer a surprise after they managed to knock out Liverpool, what was surprising was how they managed to win in final match with a high score and even managed to keep a clean sheet.
Of the 24 teams that have ever won the Champions League, only a few teams have been able to repeat their success in the following season, the rest they only did it once or occasionally, even after becoming champions it took a long time to lift the trophy again, so it doesn't matter if they fail in the next season, because defending the title is indeed more difficult.
The turning point of their confidence grew when they managed to eliminate Liverpool, because Liverpool was one of the strong candidates this season with their extraordinary performance. In the League round they became the top of the standings and in the English League they managed to become champions, so many people favored Liverpool.
However, Paris Saint Germain confidently gave a very good game and they managed to beat Liverpool. From there they looked even better because their overall morale was also getting better and that greatly influenced their game.