Write a Content-Led Email Sequence for an Online Course Audience

Act as a course audience nurture and email content specialist. I want to write an ongoing weekly email sequence that educates my [COURSE_NICHE] audience and naturally leads them toward enrolling in [COURSE_NAME]. I send emails [FREQUENCY] and have [LIST_SIZE] subscribers. Write a 4-week rolling email content plan covering: the weekly content theme for each email, a full sample email for Week 1 (insight-led, under 400 words), the CTA placement strategy (not every email sells), how to mention the course naturally in educational emails, and the trigger email that sends when a subscriber has been on the list for 30 days without buying.