Improving segmentation accuracy involves several strategies: 1. Regular Data Updates: Ensure that your data is up-to-date and reflects the current preferences and behaviors of your subscribers. 2. Advanced Analytics: Utilize advanced analytics tools to gain deeper insights into your subscribers' behaviors and preferences. 3. A/B Testing: Test different segmentation criteria to determine what works best for your audience. 4. Dynamic Segmentation: Implement dynamic segmentation to automatically update segments based on real-time data. 5. Personalization: Increase the level of personalization in your emails to make them more relevant to each segment.