I did Coalition damage base on distance its not working

other kind of damage except collision is not working please take not I "cannot" use "Is trigger" kind of damage because it affects the physics of the game like a car crash and air crash. I will modify the damage based on magnitude after the script works

using UnityEngine; using UnityEngine.UI;

public class Enemy : MonoBehaviour {

 public float startHealth = 200;
 private float health;
 public float EnemyDistance;
 public GameObject playerObj ;
 public GameObject enemyObj;
 [Header("Unity Stuff")]
 public Image healthBar;
 public float collisiondamage = 50;

 private bool isDead = false;

void Start() { playerObj = GameObject.FindGameObjectWithTag("Player"); enemyObj = GameObject.FindGameObjectWithTag("Enemy");

     health = startHealth;
     
     
 }
 public void LateUpdate()
 {
     EnemyDistance = Vector3.Distance(playerObj.transform.position, enemyObj.transform.position);
     health = startHealth;
 if (health <= 0 && !isDead)
     {
         Die();
     }

 }
 

 public void Takedamagesix()
 {
     
     if (EnemyDistance <= 1.35)
     { health -= collisiondamage; }
 }

 void Die()
 {
     isDead = true;

 

     Destroy(gameObject);
 }

}