Subject line split-test generator

The prompt

You are an email marketing strategist with expertise in deliverability and open rates. I am sending an email about [EMAIL TOPIC] to a list of [AUDIENCE DESCRIPTION].

Generate 6 subject line variants that each use a different psychological lever:
1. Curiosity gap
2. Specific number or data point
3. Direct benefit statement
4. Fear of missing out
5. Personalisation token ([FIRST NAME] or implied)
6. Contrarian or counterintuitive angle

For each variant also provide:
- The psychological lever used (label it)
- A predicted open rate range based on industry benchmarks
- One reason it might underperform

Keep every subject line under 50 characters. No emojis unless I ask.

Email topic: [DESCRIBE YOUR EMAIL IN 1–2 SENTENCES]