Trying to Make Mesh To Volume (cloudy) object even MORE cloudy?

Question Animation

my process:

1. create cube object, and make it follow a path of a curse with a Curve modifier.

2. Then add a Volume empty object, and target the cube object with a Mesh to Volume modifier. Then add Volume Displace modifier for noise texture.

But it's not quite cloudy. Help?

Please see the link for video. https://youtu.be/W2dHUyE7V1I