Still, there are plenty of people who are interested in anime setting and seek similar niche websites. (skadate.com)
Then once we were popular within that niche, I'd go after similar niches and continue to expand. (thecollegeinvestor.com)
Cross Promote - A very popular way to grow followers in social media is cross promotion, which is when two (or more) people in similar niches collaborate to promote each other's content. (entrepreneur.com)