There are a few methods that you can use to recover your deleted PNG.
One option is to use a data recovery program that is designed to scan your hard drive for deleted files and attempt to bring them back.
Another option is to look in the recycle bin of your computer, as sometimes deleted files will remain in this folder until it is emptied manually.
If neither of these methods work, you may need to contact professional data recovery services who specialize in restoring lost or damaged files.