I'm trying to make my player move a certain speed I want it to go, but I'm having a hard time. (3D project)

I’m trying to make my player move faster in my project and I thought this code should work but it didn’t. I tried copying with the same code my jump button uses but just change “up” to “forward” and “VelocityChange” to “acceleration”.

// Start is called before the first frame update
void Start()
{
    rigidbodyComponent = GetComponent<Rigidbody>();
}

// Update is called once per frame
void Update()
{
    // Check if Space key jumps the player
    if (Input.GetKeyDown(KeyCode.Space)) 
    {
        SpaceKeyWasPressed = true;
    }

    horizontalInput = Input.GetAxis("Horizontal");

    verticalInput = Input.GetAxis("Vertical");

    if (Input.GetKeyDown(KeyCode.W))
    {
        wKeyWasPressed = true;
    }
}
//FixedUpdate is called once every update
private void FixedUpdate()
{
    if (Physics.OverlapSphere(groundCheckTransform.position, 0.1f).Length == 1)
    {
        return;
    }
 // The Jump Code to make my player jump
    if (SpaceKeyWasPressed) 
    {
        rigidbodyComponent.AddForce(Vector3.up * 5, ForceMode.VelocityChange);
        SpaceKeyWasPressed = false;
    }

    rigidbodyComponent.velocity = new Vector3(horizontalInput, rigidbodyComponent.velocity.y, verticalInput);
    //make player move a certain speed
    if (wKeyWasPressed)
    {
        rigidbodyComponent.AddForce(new Vector3.forward * 5, ForceMode.Acceleration);
    }
}

}

You should in an update make that this will happen:

rigidbodyComponent.velocity = Vector3.ClampMagnitude(rigidbodyComponent.velocity, clampSpeed);