How to make lots of tags for youtube?

i uploaded a video on youtube(http://www.youtube.com/watch?v=nSvAr9Kcb-o) and its been almost a month and i havent got as many views as i wanted... most likely because i have like 10 tags... whats the trick to youtube tags... if you wanna watch it and see how many tags you can come up that would be awesome( there is no nudity but still graphic and im sure my vid is 18+ anyway) and no im not doing this for views lol