I had already made a previous thread with another user helping me come to terms to stick with RepStorage because it is easier to do deal with. But I somehow still want to try to make it ServerStorage instead because of the guaranteed security it provides from exploiters. is there any way that I can create GUIs to access ServerStorage to display player's stats? I already have scripts that do that and everything running well with ReplicatedStorage, but no if I try to cover to ServerStorage.
You could make a RemoteFunction that is invoked everytime the player is trying to access player's stats. A server script will receive the invoke, fetch the player stats from the ServerStorage, and return them to the client in a table.
See RemoteFunction for more information.