Hello, I am not a native speaker but I have been speaking English since I was a kid. As for me, to practice a lot is the right way to be fluent in speaking English. Usually, I would watch movies, listen to music, or read novels, and whenever I found new words, I would look for the meaning and then use the words in sentences, and said them to myself in front of a mirror, or to a language partner. Cheers, Yohana.