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Domain authority is a metric developed by Moz. The higher your domain authority is, the more likely you are to earn a higher search engine ranking and to receive more and better web traffic. To increase website DA you should follow these steps. Select a good domain name Optimize on-page content Create high-quality content Make strong internal linking structure Disavow toxic links Start guest post Increase Mobile-Friendly score Increase website's loading speed Promote content on Social Media accounts

Hi there, It's also worth mentioning that in addition to a possible need to disavow poor quality backlinks, you may have "lost" quality backlinks and / or your competitors may have gained backlinks. (Keep in mind that PA and DA also take competitive landscape into consideration.) Hope this helps! Zack