How do I access variables from a game object from an instantiated prefab

I have a power up on my game, that when it is activated it instantiates a few of a prefab that I made. When the prefabs collide with an object I want points to be added to the player's score. I have tried all kinds of stuff to get the script on the instantiated prefabs to interact with the script that I have on an empty gameobject called GameControl that holds all the score info, but nothing is working for me. I think this is the closest I have gotten to getting the end result that I want. This script is on my prefab and is attempting to edit the TotalCount variable on my empty game object.

 void Start()
     {
         GameObject.Find("GameControl").GetComponent<PointCounterScript>();
         
         GameObject PointCounter = GameObject.Find("GameControl");
         Component OverallPoints = PointCounter.GetComponent<PointCounterScript>();
     }
 
 
     void OnTriggerEnter(Collider Other)
     {
         if(Other.gameObject.tag == "Person")
         {
             OverallPoints.TotalCount = OverallPoints.TotalCount + 1;
         }
     }
 }
 

I get two error messages when I try to run this. They are both "error CS0103: The name `OverallPoints' does not exist in the current context". One error for each "OverallPoints" I used on line 23. Any ideas on what I am doing wrong? Or suggestions for a better way to accomplish this? I am new to C#, so I apologize in advance if it is something obvious!