I think you can take a lot of tips from YouTubers by setting out a distinct date and time for your uploads to get visitors used to your schedule. Creating blogs on the ### Header 3various front ends getting feedback from users and discussion material and then tagging them in your video if you mention them.
3speak is still pretty small so you should also be looking to funnel people from larger platforms like Twitter or Facebook and even using YouTube as a teaser to get the full video on 3speak