You can find a niche by selecting a category from the left sidebar. Once you select a category, you see tags related to it on the top screen. For sports these

You can find a niche by selecting a category from the left sidebar. Once you select a category, you see tags related to it on the top screen. For sports these are - Board games, billiards, American football martial arts etc to name a few. I guess you didn't explored the category. You may find it useful, try it out :)