In my opinion, the French League is one of the weakest leagues among the European leagues. The quality of football in this league is not very high, the players and teams are below the Champions League level.
For a few seasons PSG performed well, among the other teams there was no team that had a chance of winning the title, perhaps they have not been very successful in the last 20 years. The 3rd and 4th teams in the Champions League will be easy opponents for other teams

The French League is absolutely nothing compared to other standard league with fierce competitive race amongst themselves. Ligue One have only entertaining features but when it comes to the real deal, they snapped out of it because they're incompetent to face major clubs. For instance, in the UEFA Champions League, we all know what always happen to Paris Saint-Germain failed attempts in numerous times. They've tried and tried until they get no hope left. Perhaps it doesn't mean they will give up but continue to make attempts because winning is sure.
Paris Saint Germain is by far the best team in League 1. Their performance last year was not bad at all, but now the UCL championship is expected from them and the League 1 championship is out of the success line for them. Winning League 1 is the easy thing. There will be no Mbappe next year, let's see how the squad will be structured in PSG.