Joy’s sister considered buying a new Mac just because she lost all her photos on the old one. “Disk Drill Pro” from CleverFiles.com is an $89 program for recovering stuff.
There’s no guarantee that you’ll get everything back, but it improves your odds. We deleted a document and then emptied the trash and Disk Drill still found the file, plus everything else we’d deleted over the past several months.
The free version of Disk Drill only finds lost files; it doesn’t recover them. A preview mode in the free version, however, lets you see the file you lost. That way you know if it’s worth paying for the program and doing the full recovery.