If there is a backup save in the Saves folder
C:\Users\Username\Documents\Electronic Arts\The Sims 4\saves
As shown in the photo below (click image to see larger view)
![](http://i.imgur.com/DkcdHBs.jpg)
You can rename the Slot_00000010.save.ver0 file to Slot_00000010.save. Basically taking off the .ver0
Load the game to see if it's there.
Do you maybe have a backup of the save some where? In a different folder on your hard drive, backup drive or OneDrive or another cloud service?
If not there may not be a way to recover it.
Like CoolSim mentioned - if nothing works, and you remember your Sim family you can try to recreate them.