Hi! When you say video marketing content, what are you referring to? What is your channel about?
Some tips for you:
1. Have a look at your competitors/people that have a similar channel to yours. Don't steal their content, but have a look at what they make videos about, which of their videos have a lot of views and engagement, and what topics they cover. As they will have a similar audience, you can get a first overview of what might be interested to them.
2. Go to Google and have a look at what people are searching for related to your channel's topics. People like content that help them solve their problems and when they have a question they usually google it. That's why Google is a good place to find topics for videos.
3. There are some nice Youtube SEO plugins that help you optimize your youtube channel and videos.
Think out of the box for the video content. (Be creative)
Tell the video content like a story( Like warner brothers cartoons used to do)
Don't blindly follow your competitors ( Take inspiration but don't copy)
Think of something that is engaging and can add value.
At the very beginning, you need to focus on your targeted audience. Make sure your videos ensure the quality that may attract the customers. Make your videos short, engaging, effective, must have called to action message.
Some solid tips to keep in mind for any audience really pertains to your video host, such as YouTube. You need to pay attention to their rules such as keyword density and such. Make sure you focus on having your targeted keywords in your dialogue because when Google's robots crawl your content