If you’re planning your next trip to photograph your award-winning star trails image, be sure you know the levels of light pollution in the surrounding areas first.
Visit The night sky in the World for this data – see two examples of their maps – The World Atlas of the Artificial Night Sky Brightness and North America (notice how polluted the night sky on the eastern side of the US is).
Armed with this knowledge, you can then decide on your exposure (how long to keep the shutter open, what ISO) and stacking / blending (normally done with Photoshop) strategy.