1. Edit and re-read posts.
I'm sure you made sure you crossed all your T's and dotted the I's but that doesn't mean you didn't still miss one. Go through your posts and double check that all your facts are correct, there are no grammatical errors and everything is spelled right. It's also a good opportunity to update what's become outdated information with "breaking news" or "developments" to make them timely again.
2. Re-evaluate your sidebars.
When you first start a blog, you often get excited by all the widgets and plug-ins you can add to your site to make it pop. But after time, you might realize that you may not like them as much or just never had a need to use them. Go through them to see which are worth deleting. Not only can it help the speed of your blog, it will be a lot less cluttered and easier to navigate.
3. Test links.
It's always been beneficial to add links to blog posts for various reasons. Unfortunately, after some time, links can change or be deleted. That means your visitors may end up seeing error messages instead of, "How Beyonce snapped her body back after baby". Save your professional image and reliability of your blog by testing old links and replacing the ones that don't work.
4. Cross-link posts.
After blogging for a while, you're bound to touch on similar topics more than once in your posts. Boost SEO, garner more comments, and help resurrect some old blog posts by cross linking them with newer posts on your site. Just make sure you don't go overboard. A link-heavy post can be even worse than a blog with none.
5. Get rid of unused categories.
Having a bunch of unused categories and tags can bog down your database and lead to error message. Not too mention, it ends up looking cluttered and lack direction. Delete tags and categories with less than three posts assigned to them to make navigation easier for your visitors.