Well for starters do as the French and don't buy your stuff in the parapharmacies but online, way cheaper!
I think LRP do some great products but they also have a lot of shit ones, it's a really confusing brand tbh. It'll spout the virtues of paraben and fragrance free in one place and then another product is full of them.
Caudalie and Avene are the other big names but there's so much more out there.
SVR is one that's often overlooked (I assume due to availability).
Nuxe I'm very meh about but some people really like it.
Unfortunately due to fragrance I've never tried anything from Erborian which is a sort of French-Korean hybrid but there's lots I'd love to try from them (their CC cream is supposed to be very good too as well as all the ginseng things).
I like the Klorane oatmeal dry shampoo for the price and it's one of the few that doesn't smell horrific and gas you out of the bathroom.
Bioderma, beyond the micellar never really tried anything else though I have been contemplating a no frills eye cream for day from them recently. Some of the Bioderma sunscreens have really high PPD ratings.
Probably forgetting about loads, which is kind of the issue with French Pharmacy, there's little info and they really don't play the blogger game so there's even less information out there. It seems the higher the price point the even more elusive they become cough... Biologique Recherche... cough. I'm half convinced Institut Esthederm doesn't even want you to know what they're selling. Avibon was a long time cheapo Retinol cream but I think it got taken off the market or replaced. And didn't Elle McPherson use some well renowned butt cream for her face?