Touching anywhere on screen the Bow is releasing the arrow

Touching anywhere on screen the Bow is releasing the arrow. I need help to convert it to touching only bow the arrow has to release not whole screen . i tried many ways but not working please help,Thank you.

public void prepareArrow() { // get the touch point on the screen

     mouseRay1 = Camera.main.ScreenPointToRay(Input.mousePosition);
     if (Physics.Raycast(mouseRay1, out rayHit, 1000f) && arrowShot == false)
 
         
     {
         
         // determine the position on the screen
         posX = this.rayHit.point.x;
         posY = this.rayHit.point.y;
         // set the bows angle to the arrow
         Vector2 mousePos = new Vector2(transform.position.x-posX,transform.position.y-posY);
         float angleZ = Mathf.Atan2(mousePos.y,mousePos.x)*Mathf.Rad2Deg;
         transform.eulerAngles = new Vector3(0,0,angleZ);
         // determine the arrow pullout
         length = mousePos.magnitude / 3f;
         length = Mathf.Clamp(length,0,1);
         // set the bowstrings line renderer
         stringPullout = new Vector3(-(0.44f+length), -0.06f, 2f);
         // set the arrows position
         Vector3 arrowPosition = arrow.transform.localPosition;
         arrowPosition.x = (arrowStartX - length);
         arrow.transform.localPosition = arrowPosition;
     }
     arrowPrepared = true;
 }