Finding a job in the English Educational Publishing/Material Development field

TL;DR What’s the best place to look for jobs in the educational publishing sector (ex. content editing, textbook writing, product developer, etc)? Glassdoor? Craigslist? Large publishing companies?

Not sure if this is allowed here, but a little bit about myself: I have a BA and a BS, taught English for a year in Korea through EPIK a few years ago, and currently work as a librarian in a junior high school in the US. I would like to move back to Korea without having to be a teacher again, but I genuinely am interested in publishing/editing, especially pertaining to educational materials. Specifically, ELT (English language teaching) material developer, editor, or researcher.

What are the best job boards to find these types of jobs? Do I even have a chance?