Why every website should be using a disavow file
The disavow file was introduced by Google after outcry from webmasters who simply couldn’t remove bad links from their profile, although not through want of trying. They were rightly worried that Google would penalize their website because of links obtained by previous SEOs / in-house marketers or by themselves but simply couldn’t get them removed.
Determining the cause of your Google traffic losses
If you’ve noticed that your website isn’t generating as much business as it once did or that your organic traffic is down considerably YoY, then it’s likely that Google has either reduced your online visibility algorithmically or taken manual action against your website.