Can I increment a static variable from a static method?

After trying to be responsible and doing the research on my own I am now fed up. I will keep this short and simple. I want to be able to use the class.method() style of access instead of instantiation or inspector drag and drop. I have:

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using TMPro;
 
 public class AccountManager : MonoBehaviour
 {
     public static float m_TradeAccount = 1000000000000.00f;//Billion
     //public static TextMeshPro m_textMesh;
     public static TextMeshPro m_AccountBalanceTMP;
     public static GameObject m_AccountBalanceGO;
 
     //https://forum.unity.com/threads/static-class-or-singleton.106694/
     //https://docs.unity3d.com/ScriptReference/RuntimeInitializeOnLoadMethodAttribute-ctor.html
     [RuntimeInitializeOnLoadMethod]
     static void OnRuntimeMethodLoad()
     {
         Debug.Log("Before scene loaded");
     }
         
     void Awake()
     {
         Debug.Log("AccountManager.Awake()");
         //Debug.Log("*" + m_AccountBalanceGO.name + "*" + m_AccountBalanceTMP.name + "*");
 
     }
 
     // Start is called before the first frame update
     void Start()
     {
         //m_TradeAccount = 1000000000000.00f;//Billion
         m_AccountBalanceGO = GameObject.Find("AccountBalance");
         if (m_AccountBalanceGO == null) Debug.Log("AccountBalanceGO not found");
         m_AccountBalanceTMP = m_AccountBalanceGO.GetComponent<TextMeshPro>();
         if (m_AccountBalanceTMP == null) Debug.Log("AccountBalanceTMP not found");
         Debug.Log("*"+ m_AccountBalanceGO.name +"*" + m_AccountBalanceTMP.name+"*");
         Account_display();
     }
 
     public static void Account_display()
     {
         Debug.Log("Display AccountManager.m_TradeAccount: " + m_TradeAccount.ToString("$000,000,000,000,000,000.0000000000000000000"));
         m_AccountBalanceTMP.text = m_TradeAccount.ToString("$000,000,000,000,000,000");//Trillions
     }
 
     public static void AccountIncrease()
     {
         m_TradeAccount = m_TradeAccount + 100.0f;
         Debug.Log("Increase m_TradeAccount: " + m_TradeAccount.ToString("$000,000,000,000,000,000.0000000000000000000"));
         Account_display();
     }
 
     public static void AccountDecrease()
     {
         m_TradeAccount = m_TradeAccount - 100.0f;
         Debug.Log("Decrease m_TradeAccount: " + m_TradeAccount.ToString("$000,000,000,000,000,000.0000000000000000000"));
         Account_display();
     }
 
 }

The secondary script calls AccountManager.AccountIncrease(): I know this works. But the dangest thing is the variable doesn't increase or decrease; Now I need serious mental help and coding support. I am cross-eyed at all the static, polymorphism and delegate preacher's C explanations. There has got to be a simple post for the simplest of answers about this. I want this post to be it. There are a lot of posts about the myriad ways to do this but my style represents the simplest way. So a developer could simply in another script write a class.method(); call. Thank you all for any responses.