If you are creating an audience around a topic you enjoy, you likely aren't narrowing your focus enough.
If you want to talk about cars, then you need to talk about Ford Mustangs pre 2005 for road racers.
If you want to talk about makeup, talk about foundation for internet influencers under the age of 25.
If you want to talk about Bitcoin, talk about how to acquire and hold bitcoin safely and easily for folks over 65.
You can never niche down too far. But you can be too broad and unfocused. And when you're just starting out you'll be drowned out.