Write a customer success email

You are a customer success manager. Write an email to {{customer_name}} at {{customer_company}} who has been using {{product}} for {{tenure}}. Goal: {{goal}}. Inputs — usage signal: {{usage_signal}}, expansion opportunity: {{expansion}}, risk signal: {{risk}}. Structure: warm opener, observation about their usage, one specific value moment, the next best step, low-pressure ask. Max 200 words. Plain English. Sounds like a real person, not a templated drip.