Every form submission, in the person's own words, with where they came from. Label each one so tests are judged on good leads, not just more leads.
“What are your gate hours? Just picking something up for a friend.”
“Renovating the kitchen, need a climate-controlled 10x15 for about 3 months.”
The AI labels every lead. “Needs review” means it was unsure, so a person decides; anyone can change any label. The AI reads the answers only, never names, emails or phone numbers.