Moving a gameobject x time every x time

I have a gameobject and I want it to move down for 0.5 seconds every 1.5 seconds (something like a movement “cooldown”). I know I´m missing the 0.5s but I´m kinda new to Unity and I don´t know how to apply it. (As extra info the game is 2d)
Hope I can get an answer :smiley:

void Update()
{
    _speed=0.0f
    StartCoroutine(Move());
    transform.Translate(Vector3.down * _speed * Time.deltaTime);
    
}

IEnumerator Move()
{
    _speed = 2.0f;
    yield return new WaitForSeconds(1.5f); 
}

}

bool stop = true;
float speed = 10f;
void Update()
{
if (stop)
{
StartCoroutine(Move());
}
}
IEnumerator Move()
{
Vector3 move = new Vector3(0, -2.0f, 0);
transform.position += move * speed * Time.deltaTime;
stop = false;
yield return new WaitForSeconds(0.5f);
stop = true;
}
I hope this can help you