Simple combo sistem

I cannot figure out why my comboState var does not increase over 1.. Below is the code, the animations are based on the comboState in another script:

public class PlayerAttacks : MonoBehaviour { [HideInInspector] public int comboState;

 private float comboReset;   //timer for combo

 [SerializeField]
 private float startReset;  //start timer for reseting the combo

 // Start is called before the first frame update
 void Start()
 {
     comboReset = startReset;
 }

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

 // Timer and Reset of the combo state
 void ComboReset()
 {
     comboReset -= Time.deltaTime;

     if (comboReset <= 0)
     {
         comboState = 0;
         comboReset = 0;
     }
     else
         comboState = comboState;
 }

 // Increase the comboState when hitting the Enemy
 void OnTriggerEnter2D(Collider2D other)
 {
     Debug.Log("ComboState: " + comboState);
     Debug.Log("ComboReset: " + comboReset);

     if (other.tag == "Enemy")
     {
         comboReset = startReset;

         if (comboState >= 3)
             comboState = 0;
         else
             comboState++;
     }
 }

}