I want to add a landing sound effect when my character lands on a platform, is there somebody that can help me?

I've already added a lot of sound effects in this and other scripts, but I'm not able to figure out how to add a landing sound effect when the player lands on one of the platforms. (Note: I've already added a variable 'landingSound'.) This is the current script:

 public float moveSpeed;
 private float moveSpeedSafe;
 public float moveSpeedMultiplier;

 public float speedIncreasePoint;
 private float speedIncreacePointSafe;

 public float speedPointMultiplier;

 private float speedPointCount;
 private float speedPointCountSafe;

 public float jumpForce;

 public float jumpTime;
 private float jumpTimeCounter;

 private bool stoppedJumping; 

 private Rigidbody2D myRigidbody;

 private bool onPlatform;
 public LayerMask whatIsPlatform;
 public Transform platformChecker;
 public float platformCheckRadius;

 /*private Collider2D myCollider;*/

 private Animator myAnimator;

 public gameManager theGameManager;

 public AudioSource jumpSound;
 public AudioSource deathSound;

 public AudioSource landingSound;

 void Start()
 {
     myRigidbody = GetComponent<Rigidbody2D>();
     /*myCollider = GetComponent<Collider2D>();*/
     myAnimator = GetComponent<Animator>();

     jumpTimeCounter = jumpTime;

     speedPointCount = speedIncreasePoint;

     moveSpeedSafe = moveSpeed;
     speedPointCountSafe = speedPointCount;
     speedIncreacePointSafe = speedIncreasePoint;

     stoppedJumping = true;
 }

 void Update()
 {
     /*onPlatform = Physics2D.IsTouchingLayers(myCollider, whatIsPlatform);*/

     onPlatform = Physics2D.OverlapCircle(platformChecker.position, platformCheckRadius, whatIsPlatform);

     if(transform.position.x > speedPointCount)
     {
         speedPointCount += speedIncreasePoint;
         speedIncreasePoint = speedIncreasePoint * speedPointMultiplier;
         moveSpeed = moveSpeed * moveSpeedMultiplier;
     }

     myRigidbody.velocity = new Vector2(moveSpeed, myRigidbody.velocity.y);

     if (Input.GetKeyDown(KeyCode.Space))
     {
         if(onPlatform)
         {
             myRigidbody.velocity = new Vector2(myRigidbody.velocity.x, jumpForce);
             stoppedJumping = false;
             jumpSound.Play();
         }
     }

     if (Input.GetKey(KeyCode.Space) && !stoppedJumping)
     {
         if(jumpTimeCounter > 0)
         {
             myRigidbody.velocity = new Vector2(myRigidbody.velocity.x, jumpForce);
             jumpTimeCounter -= Time.deltaTime;
         }
     }

     if (Input.GetKeyUp(KeyCode.Space))
     {
         jumpTimeCounter = 0;
         stoppedJumping = true;
     }

     if (onPlatform)
     {
         jumpTimeCounter = jumpTime;
     }

     myAnimator.SetFloat("Speed", myRigidbody.velocity.x);
     myAnimator.SetBool("onPlatform", onPlatform);
 }

 void OnCollisionEnter2D(Collision2D other)
 {
     if(other.gameObject.tag == "deathFloor")
     {
         theGameManager.RestartGame();
         moveSpeed = moveSpeedSafe;
         speedPointCount = speedPointCountSafe;
         speedIncreasePoint = speedIncreacePointSafe;
         deathSound.Play();
     }
 }