I have no ESL credential and do not want one...I am glad you get some measure of satisfaction from teaching ESL ...I am publishing an detaching at universities in the West in a real subject, not ESL....You could do that. Just go back to school and get a grad degree. e.You can do it. As an older person I try to nurture young people. One day you will be middle aged and I sure hope you are more educated, and are more than an ESL teacher then. You can do it!