Click button to switch between "this" function and "that" function

So this is still my first week trying to write code for a simple game I thought of, so sorry if the question sounds dumb or is answered in documentation.

So I have this character that moves with WASD, but when I press something (in this case, button I) I want the WS to move him horizontally and AD to move him vertically. Basically swapping the vertical and horizontal.

EDIT: figured out I don’t need 4 types of floats. stupid me.

void Update () {
        float vertical = Input.GetAxis("Vertical") * VerticalSpeed;
        float horizontal = Input.GetAxis("Horizontal") * HorizontalSpeed;
        Vector3 MoveDirection;

        MoveDirection = new Vector3(horizontal, 0, vertical);

        if (Input.GetKey(KeyCode.I))
            MoveDirection = new Vector3(vertical, 0, horizontal);

But I have to hold the I for the swapping to work and that’s not what I wanted. GetKeyDown and GetKeyUp don’t help either.

Can anyone help me?

You can try this under your vector3 MoveDirection.

       if(Input.GetKeyDown(KeyCode.I) && !pressed){
 MoveDirection = new Vector3(horizontal, 0,vertical);
 MoveDirection = new Vector3(vertical, 0, horizontal);