The Marketing Funnel Optimizer

Analyse my marketing/sales funnel and find the biggest leak.

The funnel stages and numbers: [PASTE — VISITORS, LEADS, QUALIFIED,
OPPORTUNITIES, CUSTOMERS]
Product and sales motion: [DESCRIBE]

Provide:
1. The conversion rate at each stage and where the biggest drop-off is
2. Whether each rate is healthy for my type of business
3. The likely causes of the worst leak
4. The highest-leverage fix (a small % gain at the right stage beats a
   big gain at the wrong one)
5. What to test first and how to measure it

Focus my effort on the one stage where improvement compounds through the
rest of the funnel.