You need new content ideas.
Well, one thing you can do is to focus on what you're interested in, and then cross-reference that with how well-represented those are on YouTube, and then cross-reference that with the cost per click average on AdWords.
Using all this information, you should be able to zero in on video content that you would love to produce and are actually passionate about that has a fighting chance of drawing lots of viewers while making you decent money.
If you have ZERO time to do the research above, try hiring a VA from Fiverr or if you prefer to pay based on results try Cognoplus or LXN interactive or other quota-based VA outsourcing lists.