Add a separate parameter to run the command using user ID by using the Cmdr data type for numbers or you could modify your code to write to a datastore for the next time the player joins by getting the players user ID by their username.
Add a separate parameter to run the command using user ID by using the Cmdr data type for numbers or you could modify your code to write to a datastore for the next time the player joins by getting the players user ID by their username.