Thanks for sharing these tips, Brian. Agree with all of these, except maybe #3 Delete zombie pages. A better strategy would be to update these pages with fresh content and convert them into a long form blog posts/guides. Deleting them entirely would mean either setting up a 404 or 301 redirect – both of which can hurt your organic traffic in the short run.
Basically, what I’m talking about here is finding websites that have mentioned your brand name but they haven’t actually linked to you. For example, someone may have mentioned my name in an article they wrote (“Matthew Barby did this…”) but they didn’t link to matthewbarby.com. By checking for websites like this you can find quick opportunities to get them to add a link.