Here are some ways by which you can improve internal linking of your blog:
1. Use a sitemap
Sitemaps are not only important for helping visitors find what they’re looking for, but they’re also an easy way to increase the amount of internal links to your important pages. I’m not talking about XML sitemaps created for search engines (although they can be important too), but rather a sitemap for your readers with links to all of your posts, or at least your most important ones.
WordPress users can use the Sitemap Generator Plugin from Dago Design to automatically create a sitemap for their blog. This plugin creates a helpful sitemap page with links to your posts arranged by category.
2. Create a FAQ
Frequently Asked Questions pages can help you to get internal links to your posts while using highly targeted keywords and phrases. Create some common questions readers might have that can be answered by your blog posts. Pose the question on the FAQ page and partially answer the question and provide a link to a particular post for more information. When phrasing the questions, use keywords that readers are likely to use when performing a search, as this can help to improve traffic from search engines. Also use keywords in the anchor text of the links to your posts.
3. Link to related posts
Linking to posts on similar topics can help your readers to find additional content that may interest them. Just as importantly, it can also improve the number of internal links to your blog posts. You can manually create related links at the end of your posts, or you can use a plugin to do it for you. WordPress users can download the Related Entries plugin.
4. Include links to your most popular posts on your sidebar
Many blogs contain links to specific posts in the sidebar. Linking to those that are the most popular is a good way to increase your page views and also to improve your internal link strength. This also can either be done manually or with the use of a plugin. Doing it manually will require updates and changes whenever you want to feature new posts, whereas a plugin like MostWanted will eliminate the manual effort.
5. Write a series of posts
One easy way of building up the number of internal links going from one post to another is to write a series. As the series is written and published each post can link to the others. If you have a very long post, consider breaking it into a series. Be careful not to do this all the time as your readers may start to feel like you are using them to gain page views.
6. Do a weekly or monthly summary
Many bloggers wrap up each month with a post that links to some of the most popular recent posts on the blog with a brief description of each. This obviously gives you a chance to add some internal links, and it can help readers who may have missed some posts as well as new subscribers who may not have had the opportunity to read some of your best work.
7. Place links on your 404 pages
Error pages are frustrating to visitors. Help make your 404 error pages more-user friendly and drive a little bit of extra traffic to some of most important posts. Most WordPress themes include a 404.php file that can be edited to include and content you want, including links. If you are using a WordPress theme that does not include a 404 file, see the WordPress Codex for instructions