How long have you got?
Basically comes down to making the most of your tags / descriptions / title.
Making sure you put your own spin on your content and make it engaging
Keeping an upload schedule
Making the most of promotion and getting the views to your videos
How? By not producing the same stuff others do. I do funny voice overs of not-English cartoons and they are, FINALLY, getting some after months of nothing (mostly thanks to me sharing them around like crazy).