Is your topic evergreen or ever changing? For instance, social media is ever changing, what was new last month is old news this month. It's important to keep an eye on trends, news, etc. I set up Google alerts for topics that I write about and watch the press release sites for news about a specific topic.
You can take a previously written article and update it, link back to it, and give people fresh news (if it's an ever changing topic). If it's ever green come back to say what's working or what has changed in that topic since your last posting. Link back to old posts for those who are just now discovering the topic.
Use social media to garner interviews on the topic or put out a request for interview subjects, experts, etc. on the topic.
Explore sub-topics. Take for instance, Natural Living: explore the who, what, when, where, why and how of it. Expand on natural living products, why people choose to "live naturally" what does it mean to have a natural living lifestyle. What does it entail... topic ideas are endless. Do keyword searches to discover new keywords related to your topic.... I could go on and on but you get the idea.