"We helped a client grow" says nothing. Specific results — even ranges where exact figures can't be shared — are what actually differentiate one agency from a hundred others making the same vague claim.
Context about where the client started makes the eventual result meaningful rather than abstract.
Even directional figures ("a meaningful increase in qualified leads") are more credible than unquantified success claims.
The specific strategy or tactics used demonstrate real expertise, not just a claimed outcome.
A named quote from the actual client adds a layer of credibility your own description of the work can't replicate.
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