I want my deleted photos back

Find the utilities section in the photos app. There should be a section that says ‘recently deleted’. Click on it and unlock it the same way you unlock your phone. If you’ve deleted the photos in the last 30 days, they should still be there. If they’re already deleted from there, I don’t think there is any way to get them back.

As MrHoffman says, they are gone. When we select pictures to remove them from "Recently Deleted," you may remember that we get this warning before the final step:

It says "This will delete the selected photos from iCloud and all connected devices." We should take this warning seriously.

Unfortunately, if you don't keep your own backups to an external drive, then there really isn't any place else to look. To back up your pictures you can just plug in an external drive, select the pictures, and use Share>Save to Files. Alternatively, you can backup to a computer:

Transfer photos and videos from your iPhone or iPad to your Mac or PC

If you haven't done one of those backups, then your remaining pictures continue to be in peril. 

Permanently deleted photos are deleted permanently.

Once re-deleted from the recently-deleted album, or after a month, they’re gone.

If no backups of these photos were made and if no other earlier copies exist, permanently deleted photos are gone.