In order to create effective exit-intent popups that can improve lead nurturing, you should consider segmenting your audience and tailoring the popups to their behavior, preferences, and stage in the sales funnel. Additionally, it is important to craft clear and compelling headlines and copy that capture the visitor's attention and communicate the value proposition and benefits of your offer or message. You can use emotional triggers, such as pain points, curiosity, or fear of missing out, to persuade the visitor to act. Additionally, design your popups to be visually appealing and consistent with your brand identity and website design. Utilize contrasting colors, images, icons, and fonts to make your popups stand out and look professional. Lastly, it is important to test and optimize your popups to improve their performance and conversion rate. Use tools like Google Analytics, heatmaps, and A/B testing to measure and analyze the results of your popups and make data-driven decisions to improve them.