To elaborate...
A good example of a successful marketing niche on Instagram is @the.prickly.pear . It’s a succulent and cactus shop and that is what all of their content is based around: cacti, succulents, and cacti and succulent art, with a dash of distinctly stating their opinions.
This works because if you’re a customer who loves cacti and girly art and you share the values of the company, you’re going to follow this page and know exactly what you’re getting and you’ll probably spend money.
So let's hone in on the above information a little bit more...
Step one: look through your customer profiles above, what is one element that your three ideal customers all have in common? What would they talk about on a first date?
(i.e. they love vintage clothes)
Step two: Take that common element and get even more specific.
(love vintage clothes from the 60’s)
Step three: Narrow it down even further.
(i.e. love vintage leather jackets from the 60’s)
Do this with three to five of the most distinct things that they share.
An example of a finished customer profile niche for the example above could be:
Women in their 40’s who make 100k per year, live in light airy spaces, have elementary aged kids, love plants, and collect vintage leather jackets from the 60’s.