Watched a buddy go through almost the same thing last year. He had like 40 prompts saved for writing product descriptions and swore by them, until his boss told him every listing read like it came from the same robot. Turns out his prompts were all like "write a good description, make it sound nice," zero detail about tone, length, who was reading it, what made the product different. He ran an experiment where he fed three totally different products through the same prompt and got back three paragraphs that were basically twins. The fix for him was adding stuff like "write this for a 30 year old guy who hates ads" or "keep it under 50 words, no fluffy words." Once he did that, the outputs actually started sounding different from each other. The prompt isn't a magic spell, it's more like a job order, and if the order is vague the model just fills in the blanks with the same safe junk every time.