We all have seen PSG this season who managed to win their first trophy, even I'm tired of seeing their x channel which almost every minute keeps posting it. LoL
But with PSG's victory this will be a big motivation for them to perform better, just as a note the UCL competition is not easy even though now PSG is a strong candidate but to win the title in a row is clearly not something you can imagine simply.
To defend the Champions League title in a row is not an easy thing to do and it might be much more difficult for PSG to maintain consistency until the semifinals for next season. PSG's motivation will indeed be higher after winning the Champions League this season but it is not easy to maintain what they have achieved. A number of other teams will also make every effort to make their team stronger so that PSG will get a much more difficult challenge compared to this season.
Not to belittle PSG but it is true as you said that defending the Champions League title is not easy especially since PSG just won the title after a long wait so I don't think too much about them.
The competition for the Champions League title is still the same as before, namely it will be fierce with the motivation and great desire of the best European teams even though the favored teams remain the same, namely the best European teams, but the competition will remain fierce and all possibilities are still possible to happen, I have followed the Champions League in the last few seasons and I do realize that in every season there are things that make the competition in this competition much more interesting and this is also possible to happen next season.