Most people writing prompts for ChatGPT/Claude/Midjourney make the same error: they write ONE version of a prompt and stop.

After going through 18,000+ prompts to build out a vault for creators and agencies, the pattern that separates mediocre outputs from genuinely usable ones is always the same — structured variable slots.

Instead of: "Write me a product description for my sneaker brand"

Use: "Write a [tone: bold/premium/playful] product description for a [product category] targeting [specific audience], emphasizing [core benefit], under [word count] words, in the voice of [reference brand/creator]"

That's it. Five variables turn a generic prompt into a repeatable system. Once you have a prompt structured this way, you can swap the bracketed values for dozens of different clients/products without rewriting anything.

The agencies and resellers who scale fastest aren't the ones with "secret" prompts — they're the ones who built variable-slot templates early and never had to reinvent them per client.

If you're building prompt systems for clients or your own content, start there before anything fancier (chaining, fine-tuning, etc.). Structure first, complexity later.