In order to get back the deleted screenshots in the Mac device, one must first consider checking the trash and the Recently Deleted in the application in which the screenshots are kept. The user must also check whether the deleted screenshot is still present in the iCloud Photos. Another place to consider is Time Machine and other backups in case they exist. Once the screenshot has been permanently deleted, it is advised not to save other data on the Mac storage as deleted files may get overwritten. There are some recovery tools that may assist in scanning and recovering the deleted images in the storage that can still be recovered. Notchox offers features that help recover photos in the supported recovery conditions for the macOS. It will aid in searching for deleted screenshots. Transfer all the found screenshots to an external location.
It will help avoid permanent deletion.
​Notchox​