If you're asking the question of how to get headhunters to notice you, it means that you don't have headhunters who are actively seeking you out as things stand.

That could most likely be because the highest likelihood that they don't exist or could be disinterested in serving your type of background.

In markets where you have lots of headhunter activity, headhunter requests are so bothersome candidates shut down. 

Thus, what I'll teach you is how to get headhunters to notice you if they haven't already.