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Hi, I think I've been doing every right here. I just got a lot of nice backlinks from relevant sites ( pr 5 and higher), I also have been doing guest blogging for weeks. But suddenly, my domain authority dropped from 35 to 33. Traffic from searches also dropped a little bit. I didnt do anything blackhat yet so I dont know what is the reason why this happen. I update my site regularly, get more and more natural backlinks, do guest blogging. Or perhaps it was because I give links to my friends' affiliate sites and got penalized?