From my experience, the best way of ranking a video on hard keywords its to drip-feed views from search
most of the common tools for it are using cookies which are being stolen from other users - the sellers of those cookies are a scammers themselves (they use illigal tools to steal the cookies) and they wont hasitate to scam you also -
sometimes they will simply wont reply after you pay, and on the good case they will sell the same cookies to other buyers (whcih will make the session expire faster)
I have manged to make it work a few times actually - I have ranked for my clients keywords with a search volume of 500k
but i didnt liked the fact that I am buying stolen cookies, so I left it.
hope the information helps.