Public and SerializedField's not showing in inspector

I was creating a script for my dnd group so we could roll character stats, after writing my script they worked and I could see them in the inspector, but then the next time I opened Unity, my code wouldn't run, it didn't show any compiler errors or anything, just when I clicked play, the button that the code was attached to did nothing.

I soon realized that "[SerializeField]" and "public" do not show up in the inspector, and the objects I was passing into them had no reference.

I had to modify my code to find the objects by name instead, but I was wondering if anyone knew of a solution to the problem, as my next project will grab presets and import them through the inspector.

CODE:

 using System;
 using System.Collections.Generic;
 using UnityEngine;
 using UnityEngine.UI;
 public class RollScript : MonoBehaviour
 {
     public static GameObject gameObjectPanel;
     [SerializeField] static GameObject[] TextGameobject;
     static Text[] texts;
 
     void Start()
     {
         TextGameobject = new GameObject[] { GameObject.Find("Display00"), GameObject.Find("Display01"), GameObject.Find("Display10"), GameObject.Find("Display11"), GameObject.Find("Display20"), GameObject.Find("Display21"), GameObject.Find("Display3") };
         texts = new Text[] { TextGameobject[0].GetComponent<Text>(), TextGameobject[1].GetComponent<Text>(), TextGameobject[2].GetComponent<Text>(), TextGameobject[3].GetComponent<Text>(), TextGameobject[4].GetComponent<Text>(), TextGameobject[5].GetComponent<Text>(), TextGameobject[6].GetComponent<Text>() 
         };
         gameObjectPanel = GameObject.Find("Main_Panel");
     }
 
     public void Exit()
     {
         Application.Quit();
     }
 
     public void ActivateRoller()
     {
         //For testing purposes
         if (Input.GetKey(KeyCode.Z))
         {
             RollGame(76, true);
         }
         else if (Input.GetKey(KeyCode.X))
         {
             RollGame(81, true);
         }
         else if (Input.GetKey(KeyCode.C))
         {
             RollGame(86, true);
         }
         else if (Input.GetKey(KeyCode.V))
         {
             RollGame(91, true);
         }
         //Stack overflow on following numbers
         else if (Input.GetKey(KeyCode.B))
         {
             RollGame(96, true);
         }
         else if (Input.GetKey(KeyCode.N))
         {
             RollGame(101, true);
         }
         else
         {
             RollGame();
         }
         gameObjectPanel.SetActive(false);
     }
 
     static void RollGame(int minValue = 71, bool activated = false)
     {
         List<int> rollz = new List<int>();
         rollz.Clear();
         int wholeTotal = 0;
         bool contains18 = false;
         List<int> rollInt = new List<int>();
         int lowInt;
         if (!activated)
         {
             lowInt = 1;
         }
         else
         {
             lowInt = 2;
         }
         for (int i = 0; i < 6; i++)
         {
             rollInt.Clear();
             for (int r = 0; r < 4; r++)
             {
                 rollInt.Add(UnityEngine.Random.Range(lowInt, 7));
             }
             //foreach (var c in rollInt)
             //{
             //    Debug.Log("<color=red>"+c+"</color>");
             //}
             rollInt.Sort();
             //foreach (var c in rollInt)
             //{
             //    Debug.Log("<color=green>" + c + "</color>");
             //}
             rollInt.RemoveAt(0);
             //foreach (var c in rollInt)
             //{
             //    Debug.Log("<color=blue>" + c + "</color>");
             //}
             int total = 0;
             foreach (var c in rollInt)
             {
                 total += c;
             }
             if (total == 18)
             {
                 contains18 = true;
             }
             rollz.Add(total);
             wholeTotal += total;
         }
         if (wholeTotal < minValue)
         {
             //print("WHOLE TOTAL: " + wholeTotal);
             RollGame(minValue, activated);
         }
         else
         {
             rollz.Sort();
 
             Console.WriteLine("Contains 18: {0}", contains18);
 
             //foreach (var c in rollz)
             //{
             //    print(c);
             //}
             for (int z = 0; z < 6; z++)
             {
                 texts[z].text = rollz[z].ToString("D2");
             }
 
             texts[6].text = wholeTotal.ToString("D3");
         }
 
     }
 
     public void backAction()
     {
         gameObjectPanel.SetActive(true);
     }
 }
 

INSPECTOR: