Spring cleaning your blog doesn't have to be quite as literal as feather dusting the cobwebs, but it can improve your blog's DA to visit the stale, forgotten corners of your site sometimes. You don't even have to overhaul them to notice an improvement, a little simple spring cleaning never hurt anyone!
I'm not an SEO expert, there are plenty of bloggers out there who are, but me and my DA of 21 are getting along just fine right now after being stuck at 18 for what felt like forever. I noticed that when I took a little hiatus from blogging in March, my SEO suffered even though I hadn't added or taken away anything from my site! There are so many little things I neglected that I realised could do with a little regular polishing from now on, and it's so easy.