Buying views to YT video, Monetize or not?

I upload quite a few videos but hardly get any views even though done the title, tags etc but there are a lot of other videos for the same keyword that have been up for years so i assume i need some views to get the ball rolling on ranking my videos
My question is should I leave the videos un-monetized until all the paid for views have been used or monetize it before i pay for the views?
My YT account is over 3 years old but only recently started to upload more to it and don't want to get it…

Buying views to YT video, Monetize or not?