Crafting Killer Cold Email Lines for Real Estate Marketing Outreach

Need Your Input & Suggestions I'm gearing up to run a cold email campaign targeting marketing heads of top real estate firms in the US. My offer? A 30-day content calendar + editing services to build personal brands on short-form content. If it doesn’t perform, we’ll refund every penny. I already have case studies and testimonials from top people in the industry I’m using Clay.com to mass-personalize these emails I already have names, LinkedIn profiles, and websites of my prospects. How can I use Clay + GPT effectively to craft killer one-liners for cold outreach? Any tips, strategies, or experience would be super valuable