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Other clubs in Ligue 1 are broke, and don't have money to get the quality of players that can strengthen their teams to be able to match with PSG squad. This is the main reason why PSG has been dominating for a while and will continue dominating. This is why the league isn't that competitive like other big leagues.
While other clubs are having difficulty recruiting star players due to limited financial strength, PSG is actually performing aggressively under the guidance of Luis Enrique. PSG defeat in the Club World Cup final is a normal occurrence in football, but overall, PSG strength is still very difficult to match for other clubs in Ligue 1.
PSG has also learned a lot from this defeat, and they will likely be busy in the transfer market again to maintain their quality and compete with other top clubs in the Champions League. They are the kings of the domestic league and will continue to maintain their position until another club is able to provide competition to them.
No Ligue 1 team can rival PSG's strength, and that's all because PSG's owners have far-above-average financial strength. Therefore, Ligue 1 teams are realistic in their approach to building a team and won't take excessive risks to win titles and build a team like PSG.
PSG was even considered a heavy favorite to win the title before the competition even started.