If you try to be “All Things To Everybody” you’ll end up being “Nothing to Nobody.”
You have to specialize to mean anything to people, especially when you’re starting out.
People want to buy from someone who is an expert in what they are looking for, and experienced with people like them.
If you are spread all over the place, they think you aren’t an expert in what they want, and you probably don’t know businesses or consumers like them.