The Next Step for Content Creation — Marketing Essentials

After you have created all of the content you can think of based on your experience and what existing clients have already asked the next step is to find out what people are already asking, so that you can give your expert opinion on those topics.
@google Keyword Planner, and Google Search are amazing tools for understanding what people are already asking. Based on what you find there you now have more things to write about.
Google Keyword Planner (Required an Adwords Account)