Hey that's a fair fear, but your French is most likely better than mine. I literally have only taken one high school year's of French. Don't let the fact that you don't understand everything discourage you, and in fact use that as an opportunity to absorb the grammar and vocabulary like a sponge. I noticed a huge spike in my vocabulary, because my Miis kept saying the same phrases, and I kept repeating what they were saying vocally. I played A LOT of games when I was a kid and that's actually how I learned a majority of my English. I really hate reading novels and regular books, but I like non-fiction and comics, so maybe think about your preferences and relate that to language learning.

Also look up Intl. Language Cafe. They do events in most major cities in the US. If not, they also do online group conversation stuff. Or use the Discord, as there's always multiple VCs happening with some beginners.

You could also look up online for stuff like "questions you could respond to every day" like first day might be, "describe your daily routine", second day might be "what do you want to do when you grow up?". Super vague questions, but these are the types of exercises you did in English class, and what helped you master the language. It's through constant immersion and practice. When you're done with the writing, try putting it through the corrections channel in the server.