restoring messages
need help getting deleted messages back
iPhone 11, iOS 15
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If you have been syncing messages with iCloud and you delete any of those messages, they cannot be recovered. What I mean by syncing messages is that you have the switch turned on in Settings>Your Name>iCloud>Messages>On. Syncing messages with iCloud keeps all of your messages in sync on all of your devices.
If you back up messages with iCloud, you have to restore a backup that contains those messages. When you restore a backup, you overwrite the contents of your device so if your backup is two weeks old, restoring that backup overwrites all data that you created for the last two weeks.
This explains how to restore a backup.
Restore your iPhone, iPad, or iPod touch from a backup - Apple Support