One suggestion would be to encourage or illicit this action from your viewers.
Perhaps during the ending credits, solicit feedback as far as what people thought of your video and what they may be interested in seeing in future videos.
When you are able to incorporate the suggestions your receive, this could encourage a following to your videos.
Don't expect the number of comments you receive to come close to the number of views. A conservative estimate would be that 1% of your viewers will leave a comment. This could be higher if you do the above... That's 1 comment for every 100 views... If you have more than this, you are doing great!