An effective advertising or marketing campaign should make it clear what kind of person your product or service is for (and not for).

And remember that the more specialized the sub-niche, the easiest it is to attract ideal customers. If your product or service is appropriate for more than one distinct sub-niche, run totally separate marketing and ad campaigns, and use a different name for each one. Just like when prospective clients saw our ads and felt, ‘This is for me’, your ads should evoke the same response in your prospective customers.

Sidney Biddle Barrows, Uncensored Sales Strategies