I need to create launch messages for communities that helped me during beta testing. Help me create messages that feel grateful rather than promotional.

My product: [BRIEF DESCRIPTION]
My waitlist page: [LANDING PAGE URL]
Communities I'm targeting: [LIST THE SPECIFIC COMMUNITIES/PLATFORMS FROM WEEK 5]

Create launch messages for each platform.

For each message:
- Keep it genuine and appreciative
- Reference specific previous interactions when possible
- Make it about thanking them, not promoting yourself
- Include clear next step (visit landing page and sign up for waitlist if interested)