Which niche can get the most direct advertisements?

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It is everywhere you want to be. It is not important to choose an appropriate niche but, comparing with the rivals you can choose. It is more beneficial rather than randomly choosing. If you will do great work on it then you will definitely get the most direct advertisements. As the niche market is very big. I can further add that there are some common ways to define niche are geographics, psychographics, demographics, price, and level of quality.