Reversing countdown timer with an OnTriggerEnter event so the timer adds time via Time.deltaTime until it reaches max assigned time.

Hi, I have the following timer script that counts down via an image the slides. I would like the timer to count back up toward my publicly assigned maxTime so long as the player is wit$$anonymous$$n a game object's box collider. I've tested the trigger even between the player and the object collider and it is working, but I am having difficulty figuring out the right code to reverse the countdown timer to have it add time. I have two scripts, one for the timer and the other to be attached to the player. The one attached to the player is where I am stuck. Could use some advice.

Timer Script (T$$anonymous$$s works so long as it is counting down. Cannot figure out how to reverse the countdown.)

using System.Collections; using System.Collections.Generic; using UnityEngine; using UnityEngine.UI;

public class StatusBarScripts : MonoBehaviour {

 public Image spiritualStrengthBar;
 public float maxTime = 60f;
 public GameObject spiritualPool;


 private float timeLeft;


 IEnumerator coroutine;
 // Start is called before the first frame update
 void Start()
 {
     StartCoroutine(DelayTimer());
     spiritualStrengthBar = GetComponent<Image>();
     timeLeft = maxTime;
 }

 // Update is called once per frame
 void Update()
 {
     if (timeLeft > 0)
     {
         timeLeft -= Time.smoothDeltaTime;
         spiritualStrengthBar.fillAmount = timeLeft / maxTime;
     }
     else
     {
         Time.timeScale = 0;
     }

 }
 void OnTriggerEnter(Collider other)
 {
     if (other.gameObject.tag == "Player" && other.gameObject.tag == "SpiritPool")
     {
         print("Event Triggered");

     }
 }

 IEnumerator DelayTimer()
 {
     yield return new WaitForSeconds(15);
 }

}

Script attached to player (I've tried many different ways to make t$$anonymous$$s work, but none of them have done the trick.

using System.Collections; using System.Collections.Generic; using UnityEngine; using UnityEngine.UI;

public class SpiritPool : MonoBehaviour {

 public Image spiritualStrengthBar;
 public float maxTime = 60f;
 public GameObject spiritPool;

 private float timeLeft;

 // Start is called before the first frame update
 void Start()
 {
     
 }

 // Update is called once per frame
 void Update()
 {
     
 }

 void OnTriggerEnter(Collider other)
 {
     if (other.gameObject.tag == "Player")
     {
         print("Event Triggered");
         timeLeft -= Time.smoothDeltaTime;
         spiritualStrengthBar.fillAmount = timeLeft / maxTime;
     }
 }

}