If you’ve been blogging for a while, you already have a lot of content. You can repurpose and repackage that content to sell. Even if the content is already free on your blog, some people will prefer to consume it in another format. Compile your best blog content into an e-book. Start a podcast based on your blog content. Put your most popular how-to posts together into an online course. Then you can sell the repurposed content on your blog.
How do you find out what is popular? There are two ways that I prefer (both free). You can use the plugin GADWP. The other way is to use JetPack. Both plugins will place an icon on your blog posts list that will show you stats like how many people visited the page and how long they spent on it. You can use that information to determine which of your blog posts are most popular.
The beauty of digital content is that you can change it whenever you want. You’re not stuck with the same material you originally published. Once you find your most popular blog posts, you can repurpose them to take advantage of their popularity. Add to the content, expand upon it, publish an ebook based on it, or write more articles on the subject. You’ve found what your readers like to read. Use that information to your advantage.