Save game by steam name client side.

I have a game that is in its final stages of being complete. But i cannot for the life of me figure out how to save and load a my players rank based on the users steam name. All the information i have gathered about saving the game locally is from using a name created by the player with a menu system. Im also not super worried about saving and loading from the user/client becuase its just a PVE game and i just need to load the players rank based on there steam name.

I did make a save system it just doesn’t work properly. When a player joins the lobby it applies the rank of the highest player to all players. Im just completely lost on loading data to a specific player.

Any information at all would be appreciated

Any luck on this?