How to rotate the enemy in 2D top down

I use that script to rotate enemy but he stop at 90 and -90 deegres. Any solution Start rotation0/-90/90

public class LookAtSth : MonoBehaviour

{

 public Transform target;

 public float rotationSpeed;

 private Quaternion lookRotation;

 private Vector3 direction;

 public void Start()
 {
     target = GameObject.FindGameObjectWithTag("Player").transform;
 }

 void Update()
 {
     direction = (target.position - transform.position).normalized;
     lookRotation = Quaternion.LookRotation(direction);
     transform.rotation = Quaternion.Slerp(transform.rotation, lookRotation, Time.deltaTime * rotationSpeed);
     transform.eulerAngles = new Vector3(transform.eulerAngles.x, -90, 90);
 }

}