Market Analysis: Online Training for Freelance Editors

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Market researchSkills
market analysis selling techniques editing teachingI'm an award-winning instructor and editor, and over the past few years, I've enjoyed teaching other editors, mostly through webinars but recently through an 8-week online course, offered through a professional association.
Teaching is fun, and I'm good at it! I'd love to stop depending on other organizations to host my training sessions, and instead begin selling online courses in editing through my own website. But online training is a highly saturated market, and anyone can claim to be good at teaching others how to edit.
What do some of the other top online instructors of editing do to set apart their training? How can I find a niche in this marketplace? Will people want to buy the kinds of courses I'd most enjoy teaching? I don't know how to even begin answering these questions.
About the company
Writing Short is Hard is an editing company. We help academics and artists communicate effectively with an audience of their peers.