Check the notification history on your phone
Use Android notification log or notification history if available
Restore WhatsApp from a recent backup
Ask the sender to resend the message
Use a third-party notification saver app on Android
Check linked devices if the message was visible there before deletion
Review any chat backup stored in Google Drive or iCloud
Enable notification previews for future messages
Use WhatsApp’s built-in backup and restore feature
Keep in mind deleted messages cannot always be recovered