I am here for suggestions on how to grow my business, which involves giving talks to companies and colleges. My business was tiny pre-covid (~$2k a year). Because of covid the topic I speak about gained popularity and my business grew ($30k a year). Most of my clients come from people from my network. Does anyone have any suggestions on how I can grow this kind of business? Or does anyone have helpful books or articles I can read that would be helpful?

Edit: based in Canada, but I do virtual talks worldwide.