How to Update Variable from GUI

I'm using the GUI to make a Turn Based Combat System with buttons. I'm having problems getting the 'void OnGUI' to update a variable outside of the GUI and keep it when a button is clicked. My goal is to have the object move to the enemy and move back to position. Here is a stripped down version of my code. I'm still new to coding any help will be appreciate.

 using UnityEngine;
 using System.Collections;
  
 public class Menu : MonoBehaviour
 {
  
     private string[] selStrings = { "Attacks", "Magic" };
     enemyObject EObject = new enemyObject();
  
     void OnGUI()
     {
        if(player.hitPoints > 0 && enemy.hitPoints > 0)
        {
           selGridInt = GUI.SelectionGrid(new Rect(0, Screen.height - 55, 160, 47), selGridInt, selStrings, 2);
           if(turn == 1)
              if(selGridInt == 0)
                 if (GUI.Button (new Rect (255, Screen.height - 48, 100, 40), "Punch"))
                 {
                     punch(player, enemy);
                     EObject.wantingToMove(2);
                     turn -= 1;
                 }
         }
     }
 }
  
 public class enemyObject : MonoBehaviour
 {
  
     public int run;
  
     void Update ()
     {
        if(run == 2)
           transform.Translate(new Vector3(0,0,1) * Time.deltaTime);
     }
  
     public int wantingToMove(int a)
     {
         run = a;
         return run;
     }

 }