Your YouTube are videos the way your blog are posts. To be effective on YouTube it is mandatory to create videos just as much as you would blog posts. In this video I elaborate more on this idea. https://www.youtube.com/watch?v=FSD68wb-jiU
Format can be as simple as length of your video. Concept, aka creative, might involve a new script, new presenter or new music. Targeting involves changing the audience. Ever thought about changing the audience? Near blasphemous.