How do I prevent my character from crouching when jumping?

Hello everyone, I have a question, how can I make my character only crouch when he is on the ground?

I tried a couple of things but they didn't work for me I appreciate if you can help me

This is my code

Game Manager

using System.Collections; using System.Collections.Generic; using UnityEngine; using UnityEngine.SceneManagement;

public class GameManager : MonoBehaviour { public GameObject menuPrincipal; public GameObject menuGameOver;

 public float velocidad = 2;
 public GameObject col;
 public GameObject piedra1;
 public GameObject aleteo;
 public GameObject aleteo2;
 public Renderer fondo;
 public bool gameOver = false;
 public bool start = false;

 public List<GameObject> cols;
 public List<GameObject> obstaculos;
 public List<GameObject> FlyingObj;
 // Start is called before the first frame update
 void Start()
 {
     // Crear Mapa
     for (int i = 0; i < 21; i++)
     {
         cols.Add(Instantiate(col, new Vector2(-8 + i, -5), Quaternion.identity));
     }

     // Crear Piedras
     obstaculos.Add(Instantiate(piedra1, new Vector2(-3, -3.1f), Quaternion.identity));
     obstaculos.Add(Instantiate(aleteo, new Vector2(5, -3), Quaternion.identity));
     FlyingObj.Add(Instantiate(aleteo2, new Vector2(14, -1.6f), Quaternion.identity));
 }

 // Update is called once per frame
 void Update()
 {
     if (start == false) 
     {
     if (Input.GetKeyDown(KeyCode.X)) 
         {
             start = true;
         }
     }

     if (start == true && gameOver == true)
     {
         GetComponent<Timer>().enabled = false;

         menuGameOver.SetActive(true);
         if (Input.GetKeyDown(KeyCode.X))
         {
             SceneManager.LoadScene(SceneManager.GetActiveScene().name);
         }
     }

     if (start == true && gameOver == false) 
     {
         menuPrincipal.SetActive(false);
         fondo.material.mainTextureOffset = fondo.material.mainTextureOffset + new Vector2(0.02f, 0) * Time.deltaTime;

         // Mover Mapa
         for (int i = 0; i < cols.Count; i++)
         {
             if (cols[i].transform.position.x <= -10)
             {
                 cols[i].transform.position = new Vector3(10, -5, 0);
             }
             cols[i].transform.position = cols[i].transform.position + new Vector3(-1, 0, 0) * Time.deltaTime * velocidad;
         }
         // Mover Obstaculos
         for (int i = 0; i < obstaculos.Count; i++)
         {
             if (obstaculos[i].transform.position.x <= -10)
             {
                 float randomObs = Random.Range(11, 18);
                 obstaculos[i].transform.position = new Vector3(randomObs, -3.1f, 0);
             }
             obstaculos[i].transform.position = obstaculos[i].transform.position + new Vector3(-1, 0, 0) * Time.deltaTime * velocidad;

         }
         for (int i = 0; i < FlyingObj.Count; i++)
         {
             if (FlyingObj[i].transform.position.x <= -10)
             {
                 float randomObs = Random.Range(11, 18);
                 FlyingObj[i].transform.position = new Vector3(randomObs, -1.6f, 0);
             }
             FlyingObj[i].transform.position = FlyingObj[i].transform.position + new Vector3(-1, 0, 0) * Time.deltaTime * velocidad;

         }

     }
 }  

}

Player

using System.Collections; using System.Collections.Generic; using UnityEngine; using UnityEngine.Audio;

public class Jugador : MonoBehaviour { public float fuerzaSalto; public GameManager gameManager; public Score ScoreScript; public Timer Timer;

 public Transform groundCheck; // se sabe cuando el jugador estatocando el suelo
 public LayerMask ground;
 public float groundCheckRadius;
 AudioSource jumpsound;
 public AudioSource Death;
 private Rigidbody2D rigidbody2D;
 private Animator animator;
 private bool isGrounded;
 public int playerJumps;
 private int tempPlayerJumps;
 private BoxCollider2D Collider;
 private GameObject[] FlyingObjects;

 void Start()
 {
     animator = GetComponent<Animator>();
     rigidbody2D = GetComponent<Rigidbody2D>();
     jumpsound = GetComponent<AudioSource>();
     Collider = GetComponent<BoxCollider2D>();
 }

 private void FixedUpdate()
 {
     isGrounded = Physics2D.OverlapCircle(groundCheck.position, groundCheckRadius, ground);
 }
 void Update()
 {
     FlyingObjects = GameObject.FindGameObjectsWithTag("FlyingObj");

     if (Input.GetKeyDown(KeyCode.DownArrow))
     {
         animator.SetBool("EstaAgachandose", true);
         foreach (GameObject Obj in FlyingObjects)
         {
             Physics2D.IgnoreCollision(Obj.GetComponent<BoxCollider2D>(), Collider, true);
         }
     }
     if (Input.GetKeyUp(KeyCode.DownArrow)) //This is where you call it instead
     {
         animator.SetBool("EstaAgachandose", false);
         foreach (GameObject Obj in FlyingObjects)
         {
             Physics2D.IgnoreCollision(Obj.GetComponent<BoxCollider2D>(), Collider, false);
         }
     }
     if (isGrounded)
     {
         tempPlayerJumps = playerJumps;
     }
     if (Input.GetKeyDown(KeyCode.Space) && tempPlayerJumps > 0)
     {
         rigidbody2D.velocity = Vector2.up * fuerzaSalto;
         tempPlayerJumps--;
     }
     if (Input.GetKeyDown(KeyCode.Space))
     {
         jumpsound.Play();
         animator.SetBool("estaSaltando", true);
         rigidbody2D.AddForce(new Vector2(0, fuerzaSalto));
     }
     if (Input.GetKeyDown(KeyCode.UpArrow) && tempPlayerJumps > 0)
     {
         rigidbody2D.velocity = Vector2.up * fuerzaSalto;
         tempPlayerJumps--;
     }
     if (Input.GetKeyDown(KeyCode.UpArrow))
     {
         jumpsound.Play();
         animator.SetBool("estaSaltando", true);
         rigidbody2D.AddForce(new Vector2(0, fuerzaSalto));
     }
 }
 private void OnCollisionEnter2D(Collision2D collision)
 {
     if (collision.gameObject.tag == "Suelo")
     {
         animator.SetBool("estaSaltando", false);
     }
     if (collision.gameObject.tag == "Obstaculo")

     {
         gameManager.gameOver = true;
         ScoreScript.StopScore();
         Death.Play();
     }
     if (collision.gameObject.tag == "Obstaculo")
     {
         gameManager.gameOver = true;
         Debug.Log("gameOver");
         Timer.enabled = false;
     }
     if (collision.gameObject.tag == "FlyingObj")
     {
         gameManager.gameOver = true;
         Debug.Log("gameOver");
         Timer.enabled = false;
     }
     if (collision.gameObject.tag == "FlyingObj")
     {
         gameManager.gameOver = true;
         ScoreScript.StopScore();
         Death.Play();
     }
     {
         if (collision.gameObject.tag == "Suelo")
         {
             animator.SetBool("estaSaltando", false);
         }
         if (collision.gameObject.tag == "volador")

         {
             gameManager.gameOver = true;
             ScoreScript.StopScore();
             Death.Play();
         }
     } 
 }   

}