Why "act as a world-class expert" is quietly killing your prompts

The role you set is the ceiling on the answer

"Act as a world-class marketing expert" tells the model roughly nothing. "World-class" is meaningless — everyone in the training set claims it. "Marketing expert" is a category so broad it collapses into an average.

An average of everything ever written about marketing is exactly the beige, safe, LinkedIn-comment output you keep getting.

The fix: three real questions

Before you write a role line, answer these:

1. What specific person would give the best version of this answer? (Not "an expert" — a named archetype: "a founder who's bootstrapped to $1M ARR", "a criminal defence solicitor with 20 years in youth court", "a Michelin-trained line cook running a home kitchen".)
2. What are they explicitly NOT? (Not corporate. Not academic. Not a coach. Not selling anything.)
3. What voice do they have? (Blunt. Warm. Dry. Impatient. Curious.)

Before / after, real prompt

Before:

"Act as a world-class copywriter and write me a landing page hero."

Output: "Unlock Your Potential. Transform Your Business. Get Started Today." You have seen this hero 10,000 times.

After:

"You're a direct-response copywriter who studied under Gary Halbert. You write like you're selling in a pub, not on a stage. No abstract nouns. No 'unlock, elevate, transform'. Every sentence must survive being read aloud."

Output: "You know your prompts are mid. Fix them in 30 seconds. Free." Different planet.

The pattern

The more specific the role, the more the model can actually inhabit it — because now there's a narrow band of training data to draw from instead of the entire beige middle.

What we do inside PromptForge

When you type a rough idea into the forge, our first job is to build the role for you: it picks a specific archetype, gives it a voice, and lists what it explicitly isn't. That alone accounts for most of the quality lift users see on the first pass — before we've even added task, context, format or constraints.

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Try the forge → and see the role it invents for your idea. Free, no card.