How to recover deleted text messages after changing iCloud settings on iPhone?

small_macaroon wrote:

I recently changed my settings from keeping texts forever to keeping texts for 1 year (Settings>My Name>iCloud>Saved to iCloud: Messages>Keep Messages). I have confirmed it deleted texts from over 1 year ago. I now wish to undo this. I have changed the setting back to keeping texts forever, but this of course did not recover the deleted texts. I had thought there was a way to undo this change within 30 days. Can anyone help?

[Re-Titled by Moderator]

If you been doing this on a regular basis How to back up your iPhone, iPad, and iPod touch - Apple Support

And not using this Set up iCloud for Messages on all your devices - Apple Support

Then you would do this Restore your iPhone, iPad, or iPod touch from a backup - Apple Support

If you don't have a backup, then there is no recovery.