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The best thing to do when you want to do seo audit you should download seo checklist seo google sheet and then you need to check all on page audit and off page audit then only you will know what is problem of your site

I know it’s so annoying when your Domain Authority (DA) just seems to be stuck! DA is based on many different factors such as link quality, the general health of your website, and often will also incorporate reference of some sort to the DA scores and metrics of the rest of the web. Occasionally, a site might have topped out as far as DA is concerned (and not a moment too soon!) especially if they haven’t gotten new, quality backlinks to push them forward.