One of the books quite often used to help with French reading is
Le Petit Prince by Antoine de Saint-Exupéry.
I'm not sure if it's too simple for your level of French comprehension, but in case it happens to be a good start, this is in the public domain - and it's a charming story.
Here's the link in our MR library:
https://www.mobileread.com/forums/showthread.php?t=51483