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

If you look further, why this league is not as competitive as other leagues is because the teams there do not have the financial capacity like PSG so they cannot buy players to compete. The level of Ligue 1 is actually far behind several other leagues and PSG's dominance cannot be separated from their financial capabilities so that the quality of the players they have is above the average of the players owned by other teams there.
Football now requires the involvement of sufficient money and that is very important because they will look strong when they are able to buy the players they need. The strength of other teams only relies on limited players and in fact it will be quite difficult for them to break PSG's dominance.
French Ligue 1 is looking for the revival, but things are looking not ideal because we are having good investment from the PSG with no other club is having enough funds to spend and having quality players which is surely big trouble for them even we have good potential but still we are having things which are not working, and they are going down after every season even now few clubs which were doing good job losing their quality and consistency which is creating problems for them in last few years we are having too much money involved which is making things challenging for the clubs.
Monaco, Lille and Nice are also losing their depth which is big trouble for the league in last season we are having Marseille also dropped due to lack of quality and consistency with these things are going the worst day by day French soccer league management needs to check reality check and having their part for the stability before it's too late.