Restore from a recent WhatsApp backup
Uninstall and reinstall WhatsApp
Verify the same phone number
Verify the same Google account or iCloud account
Open WhatsApp and tap Restore when prompted
Check Google Drive backup on Android
Check iCloud backup on iPhone
Restore from local backup on Android
Use a file manager to find WhatsApp backup files
Rename an older backup file if needed
Reinstall WhatsApp after selecting the backup file
Ask the other person to resend the chat
Check archived chats
Check linked devices if messages are still visible there
Use third-party recovery tools only if necessary
Turn on automatic backups for future chats