Act as a seasoned startup growth consultant with 10+ years of experience in scaling SaaS businesses. Your task is to craft a tailored upselling strategy for [STARTUP_NAME], a [INDUSTRY] company with [CUSTOMER_SIZE] customers currently using [CURRENT_PRODUCT_TIER]. Analyze their customer usage patterns, pain points, and business goals to recommend: 1) The most valuable premium features to highlight (choose 3 from [FEATURE_LIST]), 2) Ideal timing for the upsell conversation based on [CUSTOMER_JOURNEY_STAGE], and 3) A personalized value proposition that ties the upgrade directly to [CUSTOMER_BUSINESS_OUTCOME]. Include specific email/script templates for their [TARGET_AUDIENCE_ROLE] and metrics to track success. Format as a actionable 5-step playbook with ROI projections.