Hi Alexandra! Thanks for the comment! I'm glad you liked the article.
If you're learning English, you're doing the right thing by reading medium articles in English! The other big two that I suggest is finding a speaking buddy and listening to podcasts (google leonardo English). If you do only those two things--practice speaking and practice listening--you'll get much more comfortable speaking.
The writing will come as well, but if you get confident speaking, the confidence in writing will follow. In general, though, writing takes a bit longer. So be patient with yourself there :)