Build an Email Drip Sequence in ConvertKit

I need to build a multi-email drip sequence in ConvertKit (now Kit) that nurtures new signups toward a specific action. Help me plan and write the entire sequence.

Product details:
- Product/app: [your product name and one-line description]
- Goal of the sequence: [e.g. "get free users to upgrade to paid", "onboard new customers", "nurture leads to book a demo"]
- Trigger: [e.g. "someone signs up for free trial", "someone downloads the lead magnet", "someone joins the waitlist"]
- Target audience: [e.g. "non-technical founders building a SaaS"]
- Desired action by end of sequence: [e.g. "upgrade to Pro plan", "complete onboarding", "book a call"]
- Sequence length: [e.g. 5 emails over 10 days, 7 emails over 14 days]
- Tone: [e.g. "founder-to-founder casual", "professional and helpful"]

Build the complete sequence:

1. Sequence architecture:
   - Map out each email with: send day, purpose, subject line, and primary CTA
   - Show me the timing logic — why each gap (1 day, 2 days, 3 days) matters
   - Identify the "hero email" — the one most likely to convert — and place it strategically
   - Include one "last chance" or soft-close email at the end

2. Write all emails:
   For each email in the sequence, write the complete copy:
   - Subject line (A/B variant included — give me two options per email)
   - Preview text (the snippet shown in inbox)
   - Body copy (150-250 words per email)
   - One clear CTA per email (button text + link placeholder)
   - P.S. line where appropriate (these get read more than you think)

   Follow this pattern across the sequence:
   - Email 1: Welcome + quick win (deliver value immediately)
   - Email 2: Pain point + story (why [problem] matters)
   - Email 3: Social proof (case study, testimonial, or result)
   - Email 4: Objection handling (address the #1 reason people hesitate)
   - Email 5: Direct ask with urgency (clear CTA to [desired action])

3. ConvertKit setup instructions:
   - Create the Visual Automation in ConvertKit
   - Set the entry trigger: [tag added / form submitted / purchase]
   - Add each email as a step with the correct delay
   - Add a conditional check: if subscriber has already [converted], exit the sequence
   - Tag subscribers who complete the sequence without converting as "nurture_stalled"

4. Segmentation and personalization:
   - Use ConvertKit's conditional content blocks to personalize by:
     - First name (with fallback)
     - Plan type or lead magnet downloaded
   - Show me the Liquid syntax for a conditional block in ConvertKit

5. Performance tracking:
   - Which metrics matter for each email (open rate vs click rate vs conversion)
   - When to A/B test a subject line vs body copy
   - Red flags that mean I should rewrite an email
   - Benchmark conversion rate for this type of sequence

Write the emails in full — not summaries. I should be able to copy-paste them directly into ConvertKit.