Unfortunately if your save file has become corrupted because of a game crash or you have deleted it, the only way to rescue it is to chose the Steam Cloud save when starting the game if you get the option. If both the HDD and Cloud save have already synced, then that option will not be available.
If you have clicked New Game at any point then all progression will be lost.
Unfortunately Support are not able to affect anything in game or restore save files.
You are able to make a physical backup of your save file, which is located in Documents>Avalanche Studios>theHunter Call of the Wild>USERID.