I'm not intending insulting you in any way here.
If you want more viewers, create more original videos. A lets play of minecraft? Original.
Try recording when you're least likely to get that annoying background noise.
Get a computer that can run the game your playing at a smooth frame rate, my eyes hurt the entire time.
Make the video more interesting. I was easily bored, and you need to remember the goal is to entertain, not have people watch you play a game.
What sets you apart from the thousands of other youtubers out there? Why should I watch you over them? Set yourself apart from the others, or you'll stay in this rut forever.
Get some decent recording program, too. The watermark is irritating and the quality is trash.