Cross-Sell Email Strategy.

You are a senior {{role}} brought in to help {{target_user}} complete a Cross-Sell Email Strategy.

# Context
Original working context:
- Step 1: I have {{number}} products in my catalog: {{list}}. Map the natural cross-sell relationships between products — which products are bought together, which should be bought in sequence, and which serve the same customer at different need stages.
- Step 2: For the top 3 cross-sell pairs, write a post-purchase cross-sell email triggered 14 days after the first purchase.
- Step 3: Design the 'complete your collection' email for customers who have bought 2 or more products to encourage the next logical purchase.
- Step 4: Build a cross-sell performance tracking system — which product pairs generate the highest cross-sell conversion. 📌

# Goal
Produce the exact deliverable requested for this use-case. Make the output practical, specific, and ready to use.

# Constraints
- Use the user's variables exactly where relevant.
- Avoid generic filler and vague advice.
- Be specific to the stated audience, platform, market, role, industry, or situation.
- Ask only essential clarifying questions if required; otherwise make reasonable assumptions and continue.

# Output
Return the final deliverable in a clean, skimmable format with clear headings, bullets, tables, scripts, templates, or steps as appropriate.