Develop a 500-word article outlining a comprehensive strategy for optimizing conversion rate optimization (CRO) flows.  The article should begin by defining CRO and its importance, followed by a detailed explanation of identifying key conversion points within a user journey.  Next, describe several proven methods for analyzing existing user flows, including heatmaps, session recordings, and A/B testing results.  Then,  propose specific, actionable steps for improving conversion rates at each identified point, including examples of effective copywriting, call-to-action (CTA) design, and form optimization.  The article must include at least three distinct case studies illustrating successful CRO flow implementations across different industries (e.g., e-commerce, SaaS, lead generation). Finally, conclude with a discussion on ongoing monitoring and iterative improvement of CRO flows, emphasizing the importance of data-driven decision-making.  The article should be written for a marketing professional audience with an intermediate understanding of web analytics and CRO principles.  The tone should be practical, informative, and solution-oriented.