Act as a seasoned sales strategist with 10+ years of experience in B2B and B2C outreach. Craft a high-converting cold cross-sell email for [TARGET AUDIENCE] who have previously purchased [PRODUCT A] but haven’t engaged with [PRODUCT B]. The email should: 1) Open with a personalized hook referencing their past purchase, 2) Highlight the complementary benefits of [PRODUCT B] in solving [SPECIFIC PAIN POINT], 3) Include social proof (e.g., '87% of [PRODUCT A] buyers upgraded to [PRODUCT B]'), and 4) End with a clear, low-pressure CTA like a demo link or limited-time offer. Keep the tone [FRIENDLY/PROFESSIONAL/URGENT] and under 150 words. Avoid jargon and focus on value alignment.