How to restore deleted notes?

Recover Note from "Recently Deleted" Folder

Step 1: Go to the "Recently Deleted" folder in the Notes app.

Step 2: Click on the "Edit" button in the upper right corner.

Step 3: Select the notes you want to recover and click on "Move To…" button in the lower left corner.

Step 4: Choose a folder you want to move the deleted notes to. Then go to the folder to view the undeleted notes.

Note: Notes in the "Recently Deleted" folder are permanently deleted after 30 days.

Restore from a backup.

Most definitely you can restore them if you backed up your phone to iCloud/laptop before they were deleted