I have two scripts and in one I want, under a certain condition, to give a command to start an action in another script.

public class joystickMove : MonoBehaviour
{
    public Text LivesUI;
    int Lives = 3;

    public void Init() 
    {
        Lives = 3;
        LivesUI.text = Lives.ToString();
        gameObject.SetActive(true);
    }

    void OnTriggerEnter2D(Collider2D collision)
    {
        if (collision.tag == "EnemyTag")
        {
            PlayBoom();
            Lives = Lives - 1;
            LivesUI.text = Lives.ToString();

            if (Lives < 1)
            {
                DeadScreen.SetActive(true);
                RestartButton.SetActive(true);
                Destroy(gameObject);
            }
        }
    }
}

How do I now run the Lives = Lives - 1; action in another script under a certain conditions?