Hi, unfortunately, once an Instagram story is deleted, it’s permanently removed from the Instagram server and cannot be recovered directly. However, if you have previously saved the story in your archive or phone gallery, you can repost it.
For the future, you might want to consider enabling the “Save to Archive” option in your Instagram settings, so that all your stories get automatically saved. Hope this helps! Did you have the “Save to Archive” feature turned on, by chance?