Feedback/help with niche

Hi, I think I have quite a narrow niche, but I’ve heard several times that making it even more specific is always better.
So basically, my niche is people in romantic relationships with PDAers (people with pathological demand avoidance, a rare and specific condition in autism). So the PDAers themselves are rare to come by, they also need to be aware of this condition (or their partners need to be aware of it anyway) and then I need to find them, which seems hard right now. I have no trouble coming across parent, but they aren’t my people..
Is this a good niche or should I narrow it down even further to women rather than anyone in a relationship with a PDAer? I suspect women are more likely searching for help but I don’t know and frankly I prefer working with men 🙂
Just a few thoughts. Thanks!