Act as a Senior Product Manager with 5+ years of experience in e-commerce personalization. Your task is to design a machine learning-driven personalization strategy for [TARGET AUDIENCE] on [PLATFORM]. Outline a step-by-step plan that includes: (1) data collection methods (e.g., [USER BEHAVIOR METRICS]), (2) model selection (e.g., collaborative filtering vs. content-based), and (3) implementation roadmap with key milestones. Address how to measure success using [KPIS] and mitigate common pitfalls like cold-start problems. Provide concrete examples tailored to [INDUSTRY].