As wp_update-1694464596ERCE-NEIGE mentioned in the comments, duolingo is a GREAT tool for supplemental French practice (can be used as an app on a phone and also on a computer). But as for reading something that could expand your French, you should be far enough along to do these things: reading articles and reading books you already know.

I find that reading short online news articles in French is a good place to start. An entire book can be quite daunting but a reasonably sized article (that’s not too academic) is a good place to start. And also something that is a good idea as wp_update-1694464596.Obertelli mentioned is to read a book translated in French that you already well in English. That way, you can follow the story even without understanding every word or sentence. Since you already know what’s happening, you can infer the meaning of a word or sentence without having to look up each word in a dictionary (which can be tedious and make reading almost miserable when you keep stopping and starting).

Another thing to note, reading/writing and speaking/hearing are all very different skills. You may be able to read very well in French but still not be able to carry on a conversation out loud. A good way to at least practice hearing if you don’t have a speaking partner is to watch movies in French (or just French movies) and have on either the French subtitles or English subtitles (preferably French but if you can’t follow it at all, use English until you build up more understanding). A couple months of Rosetta Stone should be enough for you to be able to comprehend simple movies in French (probably not every single scene but you should be able to get the overall concept)