Is Paris fun as a solo traveler or lonely?

Looking for where I go after a retreat in the French countryside this fall. First week of October I need to find somewhere else to explore. This is my first time visiting France and the language barrier does intimidate me.

Any recs for best cities to visit as a solo female traveler in the Fall, easily accessible from Toulouse since there is where my retreat is.

I'm open to Marseille/Bordeaux/Paris etc or even going to Basque region I just need some guidance! Cost isn't too much of a concern, but keep in mind I am not splitting hotels with anyone it is all me.