Can't reset speed

I want to reset the ball speed to its original state, because everytime it touches a trigger it gains 1.2 speed, but I'm not being able to reset the ball to its original speed.

My code is like this so far:

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class Bola : MonoBehaviour
 {
     public float speed = 2.0f;
     public float maxSpeed = 10.0f;
     private Rigidbody2D rb;
     private Vector3 startPosition;
     public float difficultyMultiplier = 1.2f;
     private AudioSource audioSource;
 
     private float x;
     private float y;
     
     void Start()
     {
         rb = GetComponent<Rigidbody2D>();
 
         startPosition = transform.position;
         Launch();
 
         audioSource = GetComponent<AudioSource>();
 
     }
 
     void Update()
     {
 
         if (this.transform.position.x >= 9f)
         {
             this.transform.position = new Vector3(0f, 0f, 0f);
         }
 
         if (this.transform.position.x <= -9f)
         {
             this.transform.position = new Vector3(0f, 0f, 0f);
         }
     }
 
 
     private void Launch()
     {
         if (Random.Range(0, 2) == 0)
         {
             x = -1;
         }
         else
         {
             x = 1;
         }
 
         if (Random.Range(0, 2) == 0)
         {
             y = -1;
         }
         else
         {
             y = 1;
         }
 
         rb.velocity = new Vector2(speed * x, speed * y);
     }
 
     private void OnCollisionEnter2D(Collision2D collider)
     {
         audioSource.Play();
     }
 
     public void Reset()
     {
         transform.position = startPosition;
         Launch();
     }
 
     private void OnTriggerEnter2D(Collider2D collision)
     {
         if (collision.gameObject.tag == "Raquete")
         {
             if (difficultyMultiplier * speed < maxSpeed)
             {
                 speed *= difficultyMultiplier;
                 rb.velocity *= difficultyMultiplier;
             }
         }
     }
 }

If anyone could help me, I would be very grateful!