Have you ever actually thought about what a niche really is? Can you give me a simple definition of a niche?
I’m tempted to write no more until I have some answers, but I won’t prolong it 
I recently read a blog post that includes a section on marketing to a demographic rather than a niche and I found it really interesting. A demographic is group of similar people whereas a niche is a group of people with a similar problem – parts of a demographic may be more likely to have a problem but not everyone in a demographic will.
Not convinced? Think about all parents who run a business (demographic) – do they all need to find childcare to enable them to work? Of course not as some have teen or adult children, some have a partner who cares for the children and some have a business that can cater for the children. Do they all have to do things on the cheap because they have no money? Definitely not as many self-employed parents run very successful and profitable businesses. Do they all need a professional writer to help them with their website copy or blogging? Afraid not as some are excellent writers themselves, some don’t have or want a website/blog and others get family or friends to help.
That simply, there are three niches within the demographic of parents with a business. Marketing a niche is easier and more effective so who are you targeting? Do they share a problem you are offering to solve?
