This is not about getting maximum votes (that is also needed though), it is about the niches which users on HIVE read and interact more.
Niche and Maximum Exposure are kinda contradicting concepts. If you want to have deep and meaningful interactions in some kind of specific topic (niche) you should think about things that you are really good at or what you really like and would enjoy devoting a lot of time to get good at. And do that. Not ask what people want on Hive. People want a lot of very different things. The key is to be good at those things and know what you are talking about.