I don't doubt at all that you would have something to teach students about English, and perhaps even to English natives with no knowledge of grammar; yes, even to English native English teachers who the system has let down.
Do you concede that there is much you could still learn from English native speakers?
In terms of other language elements, I'm ready to learn from you right now. In particular, the English language rationality (not the orthography). The freedom in word formation; sentence structure which is strictly ordered, and more.