I know this may be a bit dismissive, but I think the need to ask that is the problem. AI can definitely build a design for you. But is no substitute for design skill.
The best way to figure out how to prompt an LLM is to develop design skills so you know what to tell it.
I totally hear what you’re saying.
I’ve been in the industry a long time. Even before LLMs, I think web design would get stuck in cycles. So I just want it to spit out something that looks novel and interesting, which pushes me to coach it even better.