You can assess the health of your marketing funnel by tracking website traffic, visitor-to-lead conversion rate, lead-to-customer conversion rate, customer retention rate, and/or customer churn rate. Tracking these metrics over time will provide a baseline for how effective your current marketing efforts are at driving customers to your website, converting them into leads and customers, and keeping them engaged over time. Additionally, measuring customer health scores can give you a good indication of how loyal customers are and how likely they are to stay with your organization in the long run.