If you have a website related to the video that get's a good amount of traffic I would recommend you posting in on the homepage, and if not I would recommend you sharing it with personal connections or via social media site's EX: Facebook, Twitter or Tumblr.
Important tip: The more views you get on youtube the higher it goes up in Youtube search, so every view counts!
Take advantage of the social networking sites specifically Facebook. Write interesting and attention catching description of the video before sharing it. Make sure that it is appealing enough for your Facebook friends/subscribers/likers to view it.