It really depends on what you want to do with your French skills. I'm mostly interested in reading, so I started reading books (logically enough).
I'm not sure when exactly during this process I finished the Lingvist French course (as it was back then), but I started with short children's books, then read a detective novel by Simenon, and eventually read more complex and longer stuff.
Every finished book felt like a huge accomplishment! I didn't always understand every word or even every sentence, but I understood enough to follow the plot and to be able to judge if a particular sentence was important or not. And you can always go back in the book if you realize you've literally lost the plot.
I especially enjoyed reading books on the (free!) Kindle and Kobo apps on my phone, as they make it really easy to look up unknown words either in a French--English or French--French dictionary. And old books like those by Jules Verne are free to download! (You have to buy them, but the price is 0 €.)
On the other hand, managing to read real paper books feels like more of an accomplishment. And I felt that my reading ability was really improved by doing the Lingvist course. It was always fun to run into a word in a book that I'd already learned on Lingvist!