Hi MizbaCMU,
As per my experiance there are so many issue can be create issue. Please check following issue , might be help you or get the information -
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A decrease in social media shares and engagement can impact your site’s visibility and authority indirectly.
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Ineffective internal linking strategies can prevent search engines from understanding the hierarchy and importance of your pages.
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Updates from search engines like Google can indirectly affect your DA by changing the landscape of SEO.
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Using outdated or black-hat SEO techniques can lead to penalties that affect your DA.
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A rapid increase in low-quality links can dilute the quality of your link profile.
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Accumulation of spammy or low-quality backlinks can reduce your DA.
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If high-authority websites remove links to your site, it can negatively impact your DA.
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If the websites linking to you lose their authority, it can affect your site's DA.