Rotate particles around player while moving up

I have the following lines of code:

void OnTriggerStay(Collider col)
    // Keep us at orbitDistance from target
    myTransform.position = col.transform.position + (myTransform.position - col.transform.position).normalized * 0.8f;

    myTransform.RotateAround(col.transform.position, Vector3.up, 2000 * Time.deltaTime);

This will rotate my particle object around my player. The pivot point of my player is at his feet so it starts rotating around the ground area. I would slowly like to increase its y over time so that it looks like the particles rotate from his feet to his head.

I tried using:

myTransform.Translate(Vector3.up* 10 * Time.deltaTime);

alongside this code, but the particles just get stuck. Is there a way I can achieve this?

if you set the position with a nested empy gameobject at his feet and at his head then you can use a smoothdamp