Identify what your audience will pay for
Not every blog audience buys digital products. The ones that do have a specific goal they want to achieve faster, a problem they want solved completely, or a skill they want to learn systematically. Survey your readers or study what they comment and email you about. The best digital products answer a question your free content raises but does not fully resolve. If your blog posts answer "what," your product answers "how, exactly, in my situation."