1: Write for the Archive
If you regularly update your blog, don’t be afraid to do a bit more work. Write an extra article that, even though you post it as a normal article, is more intended for your archives. Consider writing articles that are very technical or that are more informational than entertaining. If people are looking for information on those subjects, it will be useful if you have articles about it in your archive.
2: Tag
Tag your posts and don’t skimp on the number of tags you use. You don’t get charged per tag, so there’s no point in only using a few tags on each post. Think of every possible subject to which the article applies and make sure that you add the appropriate tag. WordPress makes it easy for people to search through your content by tag, so you want to make certain that it is labeled appropriately and that they can find the article when it suits their interests.
3: Guest Bloggers
If you’re having a hard time generating enough content to build up a good archive, consider having guest bloggers write articles for your website. As a bonus, you can add tags that include their names, which will make it easy for fans of that particular blogger to search through your archives to find articles that the blogger in question has written for your site.
4: Encourage Comments
Remember that readers will sometimes leave interesting information in the comments section. Open your blog up to comments. Having comments on your blog doesn’t necessarily mean that you have to interact with the readers who make them. It does, provided you require approval before the comment is posted, provide an easy way for you to add more information about your post to your articles and, therefore, to archive more relevant information on your site.