How to add diving to my script?

I am making a 2D battle platformer, and I would like to add diving, but it seems really hard, as I am pretty new to coding. I watched some videos, but none of them were what I was looking for. I decided to leave it up to the professionals. Here's my code what I want is the player to launch in the direction they're facing, and to launch up in the air at the same height as jumping.

Here's my code: using System.Collections; using System.Collections.Generic; using UnityEngine;

 public class Movement : MonoBehaviour
 {
     //Variables
     [Header("Movement")]
     //Input Variables
     public float playerSpeed = 5f;
     public float jumpheight = 5f;
 
     private int extraJumps;
     public int extraJumpsValue = 1;
 
     [Header("Physics")]
     //Physics stuff
     public LayerMask ground;
     public Rigidbody2D rb;
     public Transform player;
 
     bool isGrounded;
     public Transform groundCheck;
 
     [Header("Animation")]
     //Animation
     private bool facingRight;
     public Animator anim;
 
     public ParticleSystem jumpParticles;
 
     [Header("Sounds")]
     public AudioSource audioSource;
     public float Volume;
 
 
     //Start Function
     void Start()
     {
         extraJumps = extraJumpsValue;
         audioSource.volume = Volume;
     }
 
     //Moving
     void FixedUpdate()
     {
         isGrounded = Physics2D.OverlapCircle(groundCheck.position, 0.5f, ground);
 
         float x = Input.GetAxis("Horizontal");
 
         rb.velocity = new Vector2(x * playerSpeed, rb.velocity.y);
 
         if (facingRight == true && x > 0)
         {
             Flip();
         }
         else if (facingRight == false && x < 0)
         {
             Flip();
         }
     }
 
     //Jumping
     void Update()
     {
         anim.SetFloat("Horizontal", rb.velocity.x);
         anim.SetFloat("Speed", rb.velocity.sqrMagnitude);
 
 
         if (isGrounded == true)
         {
             extraJumps = extraJumpsValue;
         }
 
         if (Input.GetButtonDown("Jump") && extraJumps > 0)
         {
             rb.velocity = Vector2.up * jumpheight;
             extraJumps--;
 
             //Particles
             jumpParticles.Play();
 
             //Sounds
             FindObjectOfType<AudioManager>().Play("Jump");
         }
         else if (Input.GetButtonDown("Jump") && isGrounded == true)
         {
             rb.velocity = Vector2.up * jumpheight;
         }
 
         DidIDie();
         Attack();
     }
 
     //Flips the player
     void Flip()
     {
         facingRight = !facingRight;
         Vector3 Scaler = transform.localScale;
         Scaler.x *= -1;
         transform.localScale = Scaler;
     }
 
     //Checks if player has died
     void DidIDie()
     {
         if(player.position.y <= -10f)
         {
             transform.position = new Vector3(0f, 0f, 0f);
         }
     }
 }
 

Thanks in advance Also It should be physics based, as the game is entirely built on physics.