I want to start a blog. Should I create one for introverts in general or for a certain niche like MBTI Type?
The broader your niche, the less people are going to care about what you write.
The more focused your niche, the more missed you will be, if you decide to stop writing.
Create your blog on the smallest possible segment in your general niche and make it the best in the world.
The one that people can’t live without.