you can do this method or use a save repair toolkit on Nexusmods
same thing happened to me but I managed to fix it.
first thing I did was to disable steam cloud saves for Windrose
Then I went to the save folder location of the game (it is called Save Profile). Copied it to desktop, then I deleted the save folder (not the one I copied) and launched Windrose.
The game should make a new character, I just hit next until I hit the main menu and exited the game.
After that I went to the newly created save folder, and looked for a folder with numbers on it (there should be two, ignore the one named back ups)
Inside of the folder with numbers, there should be a folder named RocksDB delete the contents inside. [This part is important]
After deleting it i went back to the backed up folder on your desktop. now head into the folder with numbers_back up. there should be lots of folders with numbers on it. those are the back ups that the game made. make the folder from earliest to latest. now choose one of the folders and copy the contents inside and paste it on to the RocksDB folder from earlier. Personally for me the first 2-3 back up folders failed on me.