The mistake most people make prompting these tools is starting with "build me a website." That skips straight past the thing AI is actually good at (planning and structure) and jumps to output.
A better prompt front-loads the thinking.
A strong wireframing/planning prompt has four parts:
Mega Prompt to create a Sitemap in Relume:

"I'm planning the site structure for [company], a [B2B/B2C/CPG] business that sells [product/service] to [audience]. The primary goal of the site is [lead generation / e-commerce sales / bookings]. Map out a full sitemap including homepage, service or product pages including (list pages), and any supporting pages like about, blog, or FAQ. For each page, give me a rough content outline - what the H1 should communicate, what sections should exist, and placeholder top-line copy. Don't design final visuals. I want directional structure and copy I can review with my team before we move to design."