DA can drop for multiple reasons.
Though take it as a reality check that you need to improve your site. It is more than backlinking. Your competition is getting better.
Posts made by Mr_Greg
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RE: Why My Domain Authority Droppedposted in Link Building
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RE: How to Increase Website Visibility on Google and Bing?posted in Link Building
Post original quality content consistently and increase your presence through sharing your links as you have done here.
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RE: how can i get up my da?posted in Moz Tools
You can't just get your DA up overnight, you need to have good quality content with a strong backlink presence.