Update your old post
As your blog grows and you begin to cover more and more subjects about your niche, there comes a time when you need to update your old post. I don’t mean to go back rewrite all of your old post. I mean as you gather more articles about the subject you’re preaching about, go back and create trackback links in your old post to the new articles.
When you first started your blog, you probably had a lot of things that were the first things for you to post about(they had to be at some point). Well, as you build on these concepts that you talked about in the past, you can go to your old post and link to the new ideas that you’ve formulated. This helps keep the reader reading. They’ll get a lot more information out of your post too. This is a lot easier than your reader finding one thing to read on your blog then having to search for a new one to build off of what they learned. Keep the reader hooked, keep them on your blog. They shouldn’t need another blog for information, you should give them all the information they need.
Also, always make sure that the links are trackback links, not regular links. The trackback links help the readers find your old post, also. It is probably a good idea to mention that you have already written related topics about the subject and give links to the articles, too.
The main focus here is keeping the reader interested in your blog. You want to strive to keep them coming back for more.