My DR from Ahref decrease from 12 to 4

Probably either an update on their algo, or you lost some strong backlinks. Check out your backlink profile. I see no movement for my websites
 
They'll reduce your DR if you're not getting new backlinks after an initial campaign. This is a precaution to get rid of churn & burn projects. You can regain your DR by building more backlinks.
 
You shouldn't care about it cause their DR is useless for seo, google.
 
Bear in mind that DR is a metric that can be manipulated easily. The reason for what happened with you is either an algorithm update on Ahrefs, or you lost a strong backlink. You can be sure by checking the lost backlinks section on Ahrefs. If you don't find any, there was definitely an algorithm update
 
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