1. Place internal links to previous posts or link to a category.

2. You should probably avoid disrupting pop-ups, especially the ones who interupt the reader in the middle of the post.

Keep pop ups cornered or show at exit.

3. Add related posts as gallery link under your blog.

The plugin: WP Gallery Custom Links allows you to add separate links to every gallery picture.

4. Pay attention to your website loading time.

Pingdom - Check Your Website Speed

5. Cut out distractions as autoplay audio, autoplay video and too many ads.