To improve or maintain high Quality rating
1. Make sure messages follow the WhatsApp Business Policy
2. Only send messages to users who have opted in to receive messages from your business.
3. Make the messages highly personalized and useful to users. Avoid sending open-ended welcome or introductory messages.
4. Be mindful of messaging frequency; avoid sending customers too many messages a day. Be thoughtful of informational messages, optimizing for content and length.