Great answers here - but some suggestions may be a bit complicated for you to understand (if you're not already familiar with the technique they're referring to).
The advice of "links" & "diversify" are the two simplest and effective ones I saw.
But you'll still be in the same boat every month - get your video ranked, and then have it replaced in the SERPs by someone else's video, again and again.
You need consistent income using video. So just do what I do...
1. Advertise the following service on websites where very wealthy Japanese business men hang out (ie. Google '
NIKKEI 225' which relates to the Japanese stock market) and collect subscribers. ie monthly recurring/rebills thru Paypal.
2. At around 10pm Japan time on work nights, you turn on your webcam, strip down to your underwear, and start dancing while the Japanese business men hurl insults a you.
That where the above mentioned subwoofers comes in. You want powerful ones turned up really high, so when one of them yells at you the sound will make you genuinely flinch. They like that.
Also as mentioned above, you can split test different subwoofers to see which one makes you flinch the most. Or rotate them on alternating nights so you don't get immune to the startling characteristics of any one subwoofer (u gotta keep up the flinching frequently and convincingly).
And one of the posters here mentioned caffeine, which is important to keep you energetic and twitchy so you can keep dancing for an hour or two straight, and be more apt to flinch when yelled at.
3. ????
4. Profit.
BTW, I got this idea while watching a Mad TV skit called 'Cabana Chat' that has the character Pool Boy.
Just do what Pool Boy does while you're on webcam with wealthy paying subscribers from Japan who are allowed to yell insults at you and it can't lose.
http://www.youtube.com/watch?v=WSamR_8rqL4
Hope that helps!