Broadly speaking, your marketing content should resonate with as large a portion of your target audience as possible. But on occasion, it's more valuable to address more specific client concerns — even if doing so limits your audience.
Occasionally narrowing the scope of your content can help your firm demonstrate your focus not just in the big-picture items, but in the smaller ones as well. This article from Barron's shows how content that isn't for everybody can still be valuable to the target audience.