Hmm, you're not writing based on experience here. I mean you've realized what doesn't work, but that doesn't mean that narrowing too much your niche will make it exponentially better. I'd like to read your story once you've gone through the process.
Maybe some people are being followed by who they are, and that wildcard of yours can be an asset. It's like "Jordan wrote a new article, I wonder what he's up to now!" making it exciting to read you because of the novelty you bring to the game.
I'm no expert just stating that there are multiple pathways to success. Now, it's great you'll test your idea and see if it really works.