Pay attention to the newly added and lost links, and analyze the reasons for the lost external links, why they are included and lost, is there a problem with the links on the site, or the resource site has forbidden the removal of the link, you can contact the resource site site manager, re edit link. If the domain name is banned and it is no longer possible to send dofollow links, then the resource will be abandoned. 2. Depending on the number of searches for external links, pay attention to the survival rate and the number of link inclusions, and also filter out resources that may be constantly released. 3. Check your site's backlinks for weird anchor text, find the relevant article source, and fix it. 4. Check for low quality incoming backlinks. Sometimes you will find some backlink sources that you have never seen in GSA, they come from low quality spam sites. You can currently disavow this link directly with GSA and opt out of linking to your website to avoid spammy links.