Set up a SEMrush premium account, screenshot the dashboard on day one and made a note of domain authority (I know but its easier to explain). Delisted a load of dodgy domains, cleaned up the content on the blog (hundreds of pages of thin content, rewrote 50 articles that targeted key terms or ranked well but were out of date. Sorted out 404s. Cleaned the site map.

Within one month we saw traffic improvements, SEMrush went from 40% to 50% and the domain authority jumped by 10.