Нужен ли преподаватель иностранного языка

I am a methodologist known for my own system of teaching foreign languages, which has been attempted to be copied. I have written articles on language learning. I offer free first three lessons in my English school, with no prepayment, in a convenient location in central Moscow, intensive 120‑minute lessons with strong teachers in small groups, also online. Over 60% of all levels continue after the free part. I have structured reviews from real students with details. No negative reviews in nine years. I run group courses three times a year, with offline and online streams.