How to run the same script multiple times in code but with different instances of it

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using System;
 
 public class Timer : MonoBehaviour
 {
     private bool doReturn = false;
     private float time = 0.0f;
     public bool Ability(Action action, float time, string key,bool DoLoop)
     {
         if (Input.GetKeyDown(key)&&!DoLoop)
         {
             doReturn = true;
             StartCoroutine(LateCall(time, action));
         }
         else if(Input.GetKeyDown(key)&&DoLoop)
         {
             doReturn = true;
             StartLoop(action, time);
         }
         return doReturn;    
     }
     private IEnumerator LateCall(float Duration, Action action)
     {
         action();
         yield return new WaitForSeconds(Duration);
         doReturn = false;
     }
     void StartLoop(Action action,float Duration)
     {
         StartCoroutine(DoLoop(action, Duration));
     }
     IEnumerator DoLoop(Action action, float Duration)
     {
 
         do
         {
             action();
             time += Time.deltaTime;
             yield return new WaitForEndOfFrame();
         } while (time < Duration);
         doReturn = false;
         time = 0.0f;
 
     }
 }
 

This is the full code, and if for example this code is used in another script

        Timer.Ability(RandomAbility, 3, "q", false);
         if (!Timer.Ability(RandomAbility, 3, "q", false))
         {
             DefaultValues();
         }

        Timer.Ability(RandomAbility2, 3, "w", false);
         if (!Timer.Ability(RandomAbility2, 3, "w", false))
         {
             DefaultValues2();
         }

The "Ability" won't run right because the doReturn would be changed at the first use of the script, also if doReturn would become a local variable for "Ability" there would be no way to set it False because it would require IEnumerator LateCall and IEnumerator DoLoop to do so. I tried creating a local variable and tried to pass it as an argument on the other functions but because I couldn't use pointers to change the original value of it which is given in the Ability function for I would get "UNSAFE USE" so pointer weren't an option either!

The problem here is: I need a way to make a local variable and change it in other functions, so I could run that function in another script and it wouldn't be affected by how many times I use it, more of a universal function.