I want to share some of my techniques how to drive more traffic to your site from YouTube:
1. In Description include CLICKABLE link to your site
It is common mistake to forget to list your site in video description or to list it but not make it clickable
I made experiments in the past comparing description with NON-clickable link and with CLICKABLE link and second one approach increased my traffic dramatically
2. Do video responses to videos in your niche
It is simple and obvious advice