How to move player after hitting object

So I am making a 3d platformer game in unity, and I want to make a section where when I hit one of the platforms it sends me shooting off it. This is my code for my move script

 private void Start()
 {
     controller = gameObject.AddComponent<CharacterController>();
 }
 void OnCollisionEnter(Collision collision)
 {
     if (collision.gameObject.CompareTag("JumpPad"))
     {
         jumpHeight = JumpPad;
     }
     if (collision.gameObject.CompareTag("FallPad"))
     {
         jumpHeight = 3f;
     }
     if (collision.gameObject.CompareTag("GravityPad") && Input.GetButtonDown("Jump"))
     {
         gravityValue = 3;
         playerVelocity.y += Mathf.Sqrt(jumpHeight * -3.0f * gravityValue);
         Debug.Log("Jump");
     }
     if (collision.gameObject.CompareTag("PickUp"))
     {
         collision.gameObject.SetActive(false);
     }
 } 
 

 void Update()
         {
             groundedPlayer = controller.isGrounded;
             if (groundedPlayer && playerVelocity.y < 0)
             {
                 playerVelocity.y = 0f;
             }

             Vector3 move = new Vector3(Input.GetAxis("Horizontal"), 0, Input.GetAxis("Vertical"));
             controller.Move(move * Time.deltaTime * playerSpeed);

             if (move != Vector3.zero)
             {
                 gameObject.transform.forward = move;
             }
             
             // Changes the height position of the player..
             if (Input.GetButtonDown("Jump") && groundedPlayer)
             {
                 playerVelocity.y += Mathf.Sqrt(jumpHeight * -3.0f * gravityValue);
                 Debug.Log("Jump");
             }

             playerVelocity.y += gravityValue * Time.deltaTime;
             controller.Move(playerVelocity * Time.deltaTime);
         }
 }

I want to change the player's velocity so that it goes, I've tried other code but none of them work.