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Hello! Small sites generally won't stay in our index if we don't find NEW links to a domain. Our cache will remove a link after 190 days unless re-crawled. https://moz.com/researchtools/ose/just-discovered?site=moz.com&filter=&source=&target=page&page=1&sort=crawled I recommend checking Just Discovered to see if your domain is in queue for re-indexing from new discovered links. If not, you will want to keep link building on sites that have high authority and are likely able to be picked up.. There are some insight provided here that will help: https://moz.com/community/q/da-pa-fluctuations-how-to-interpret-apply-understand-these-ml-based-scores Cheers!