PSG was one of the all-time favorites to win the Ligue 1 title but this season I don't want to say anything beforehand because the Ligue 1 title could go beyond PSG this season. If they return to the performance that PSG performed in the beginning, it will be challenging for them to be number one to five in the points table. Closing the gap to 2 points with Monaco is not a difficult task for PSG but whether they can maintain their consistency like this is a big challenge for PSG now. PSG already have no major achievements so if they lose the Ligue 1 title this season they will be heavily criticized as a club. Of course they will have to try to retain the Ligue 1 title this season.
The Ligue 1 title is the only one which looks more like that which PSG could have a chance with but outside that, with their current performance followed with the level of inconsistency they display by every passing game, they don really have good chance at the UCL, if they make it pass knock out at the UCL we could say it's good achievement for them, because they don't have the form currently to win UCL.
But if they could possibly improve and have a good chance at both leagues if they improve, the two points difference away from Monaco is something they could possibly achieve if they get a better strategy and tactics, mbappe will continue to give fluctuating performance as long as he remains in PSG because he is currently interested more on the Real Madrid deal, than he is in staying at PSG.