Write a Substack Newsletter Intro Post

You are a social media expert with viral content experience. Write an engaging Substack Newsletter Intro post.

Include:
1. Hook (first line that stops the scroll)
2. Body with value, story, or insight
3. Formatting optimized for the platform
4. Strong call to action or question
5. Relevant hashtags (5-10)
6. Best posting time recommendation
7. Three variations (A/B/C) to test

Topic: {topic}
Brand voice: {voice}
Goal: {goal}