Discover how to choose a vertical niche for your SEO agency, build authority in it, and use specialization to charge more and win better clients.

Narrow enough to be searchable and memorable by your target clients, broad enough to have 500 to 1,000 addressable businesses in your target market. SEO for tech companies is too broad. SEO for HR tech SaaS companies is appropriately specific. The test is whether a prospect can immediately recognize whether they are your target client from your positioning statement.
Run the addressable market calculation before committing: how many businesses exist in this niche, what is your realistic market share over three years, and does that support the agency size you want to build. If the math does not work, adjust the niche definition slightly or combine two adjacent verticals that share the same SEO challenges.
Yes. Keep serving existing clients as they are, but direct all new business development toward your chosen niche. Within six to twelve months the mix will shift naturally. Some generalist clients will not renew. Use that as an opportunity to replace them with niche-specific accounts at better rates rather than filling the gap with another generalist client.