I need help restoring my messages

For one of the previous discussions with links to what to do and when, click here ⬇️

https://discussions.apple.com/thread/251641899?answerId=253162120022#253162120022

and follow the instructions in that reply.

If iCloud Messages is enabled, don’t bother proceeding. The deleted messages are deleted.

if iCloud messages was not enabled, and you have a backup, restoring that iPhone backup will revert everything and all newer contents of your iPhone to that backup.

Other discussions can be found with the web search: icloud messages deleted backup site:discussions.apple.com

Restore using your most recent backup.