Know-How Exchange : Strategy

I teach basic computer skills for a living. I stick to basics such as Internet, email, simple computer troubleshooting and word processing. My typical client can't send an email and probably doesn't know how to surf the web. I get most of my business from print advertising. Although I put my web and email addresses in my advertising, I commonly hear "I don't know how to send an email or how to go to your web address."
I also offer workshops to businesses because I can teach advanced word processing skills and help with things like file management or even implementing new software. I can also help the business that wants to bring in computers for the first time. This group is likely online and is essentially the reason I maintain an online presence for my business.
My problem: How do I stay true to my niche of basic computer skills like sending an email and still attract a computer literate business owner who needs help training staff? I don't want to get into teaching about teaching or implementing training programs. I write articles about basic computer skills like signing up for a free email account because that's what my clients are typically interested in. It's true to my niche but chances are the CEO of X company doesn't care.
I put a fair bit of time into my social media presence, article writing and my website. But if my niche is busy reading the newspaper I'm sort of left wondering what the point is.
Question: How do I market to business owners online without changing my niche or is that even possible? Or should I just back off the online presence and concentrate on the print advertising that works?