My character is going too fast and I don't know what to do.,How do I make my character not go that fast?

I wanna learn game developing and decided to go with unity. I wanna make game wich is kindind simular to flappy bird but u can go to both directions. The only problem with it is that it goes too fast. I tried lowering the horisontalforce but than it only moves slightly. I tought maybe a speedlimit would help but I don't know how to do it. Here is my movement script

 public float horisontalForce = 0.6f;
 public float verticalForce = 0.4f;
 public float maxSpeed = 10f;
 float jumpDirection;
 void Start()
 {
     rb = gameObject.GetComponent<Rigidbody2D>();
 }
 void Update()
 {
     jumpDirection = Input.GetAxisRaw("Horizontal");
 }
 void FixedUpdate()
 {
    if (jumpDirection < -0.1f || jumpDirection > 0.1f)
    {
        rb.AddForce(new Vector2 (jumpDirection*horisontalForce,verticalForce ),ForceMode2D.Impulse);
    }
  }`