Ligue 1 is not a low caste league. Messi is playing professionally so far. he's playing well with what he can bring to the team. I don't think other clubs are willing to pay dearly for Messi at his age.
how bad is Messi's relationship with PSG and its fans? I think Messi will still play professionally for the rest of the season, if indeed in the summer Messi will leave PSG.
hopefully, Messi gets the best place in European clubs. even if he has to return to his former club.
The most important thing is not the type of league Messi is playing, weather it is a low level league and we shouldn't see it as a wrong decision joining ligue 1 amidst interest from other Leagues, All we have to look into is his level of performance as an individual, I think Messi is giving his best at 35 years as much as he can and even to a better level to the team. He has contributed positively in many ways and with the current contract extension means he aims to achieve more success with the club in the coming season mostly in Uefa champions League which is more important to the team generally.