Ball moving only diagonal

Hello Everyone

well i'm currently developing a "roll a ball" game and I finally managed to make my camera work perfectly but i have a problem with my ball because when i move it, it only moves in diagonal and i have no idea why i tried many different methods on how to roll the ball and i think the current method would be good if it moves in a 3d way (not just diagonal) the player can also rotate the ball that makes it so difficult(for me) because the transform.forward is changing constantly here is my current code:

 using UnityEngine;
 using System.Collections;
 
 public class MovePlayer : MonoBehaviour {
     
     public float movementSpeed = 10;
     private Rigidbody rb;
     public Vector3 movement;
     public Vector3 movementForward;
     public Vector3 movementRight;
     public GameObject myCamera;
     
     void Start()
     {
         //rb = GetComponent<Rigidbody>();
     }
     
     void Update()
     {
         /*movementForward = transform.forward * JoyStickMine.deltaPosition.y / movementSpeed;
         movementRight = transform.right * JoyStickMine.deltaPosition.x / movementSpeed;*/
         movementForward = myCamera.transform.forward * JoyStickMine.deltaPosition.y / movementSpeed;
         movementRight = myCamera.transform.right * JoyStickMine.deltaPosition.y / movementSpeed;
         movement = movementForward + movementRight;
         movement.y = 0;
 
     //    transform.position += movement;
     //    rb.AddForce(movement);
         rb.velocity = movement;
         
         float horizontal = JoyStickLook.deltaPosition.x * (-5) * Time.deltaTime;
         transform.Rotate(0, horizontal, 0, Space.World);
     }
 }

any help is appreciated and thanks in advance skullbeats1