Hi, I'm gonna make this quick.
Just moments I was deleting some old save files because I had too many... but, accidentally i deleted my latest save file. So I googled around to see if anyone else had done this. They had... but in all the posts that I saw, they said that the file was lost and there was no way to recover it. I lost hope
Then I remembered I had a similar situation with another game and also remembered how I restored the files. There is a program called EaseUS Data Recovery Wizard, and as the name suggests, is used to recover lost data. It's really easy to use, you just need to select the specific folder where the SSE saves are (by default: C:\Users\Usuario\Documents\My Games\Skyrim Special Edition\Saves) and just let it scan until you see the deleted save files (sort by Date modified to find it more easily) and presto! There it is... recover succesfull. Hope it helps
EaseUS DRW Download: