The Invisible Life of Addie LaRue by V.E. Schwab

The Invisible Life of Addie LaRue is a fantasy novel by V.E. Schwab about a French woman who makes a Faustian bargain for immortality in 1714, but is cursed to be forgotten by everyone she meets, leading to a life across centuries where she can leave no mark on the world until she meets a man in a modern-day bookstore who remembers her.