The phrase "niche topic" refers to a subject or area of interest that is not very well-known or popular, and is only understood and appreciated by a small group of people. Full definition
This includes thorough articles on the main types of savings products, in - depth reviews of major banks, and articles on niche topics of interest. (savingsaccounts.com)
Some are experts in niche topics, such as feminism or history. (readersfavorite.com)
Instead focus on writing about niche topics that you can dominate. (editionguard.com)