I lost 3 years of my journaling...how can I recover them? I was using the Pages app

Restore from your Time Machine backup. You do have a backup, right? Where were you storing your journal files? What folder?

We are not psychic. We don't know what you did that caused them to be deleted.

If they are not in the trash, and you can't locate them, restore the documents from your Time Machine backup.

You do back up on a regular basis, right?