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
 
Check your backilinks. May it was removed.
 
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