I think the PSG team's motivation when playing in the Champions League will be different so it has nothing to do with whatever results they get in Ligeu one.
And it must be admitted that PSG's performance this season has decreased slightly compared to last season, but being able to defend the title in League 1 is not a difficult thing because the quality difference is quite significant between PSG and other teams and financially PSG is also far superior, so it is natural only if there is no team capable of matching them in league 1.
In Ligue 1 PSG does not have a fairly balanced rival and they will continue to dominate the league forever. The difference in quality, club finances and resources possessed by PSG will be very difficult for other clubs to break. Now what PSG is doing is no longer talking about how they can get the Ligue 1 title but how they can compete in the Champions League competition. Because when it comes to Ligue 1 they don't need other great players and the quality they currently have is enough.
Luis Enrique has an obligation to manage the team and the big targets given to him are how PSG can compete in the Champions League. Their performance has not decreased and in fact I see it is much better after Luis Enrique became coach, but it is not yet fully optimal because it may take time for PSG to build a much stronger squad.