How do i make player fall faster?

So my problem is that when the player jumps it takes too long to fall down, my rigidbody’s “drag” is already at 0 and it doesnt help…

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

public class Player : MonoBehaviour {

    public float MovementSpeed;
    public float JumpHeight;
    private Rigidbody rb;
    public bool isGrounded;


    private void Start()
    {
        rb = GetComponent<Rigidbody>();
    }

    void Update()
    {
        PlayerController();
    }

    void PlayerController()
    {
        if (Input.GetKey(KeyCode.D))
        {
            transform.position += Vector3.right * MovementSpeed * Time.deltaTime;
        }

        if (Input.GetKey(KeyCode.A))
        {
            transform.position += Vector3.left * MovementSpeed * Time.deltaTime;
        }

        if(isGrounded == true)
        {
            if (Input.GetKeyDown(KeyCode.W))
            {
                rb.velocity = new Vector2(rb.velocity.x, JumpHeight);
            }

        }

    }

    private void OnCollisionEnter(Collision collision)
    {
        if(collision.gameObject.tag == "Ground")
        {
            isGrounded = true;
        }
      
    }

    private void OnCollisionExit(Collision collision)
    {
        if (collision.gameObject.tag == "Ground")
        {
            isGrounded = false;
        }

    }

}

You can increase the gravity acceleration rate in Edit>ProjectSettings>Physics.

Alternatively you could not affect the rigidbody with gravity at all, and add your own downward force to simulate gravity.

Thanks for helping me!