As others have indicated, the time for LENR is a problem - especially with 30 sec exposures or longer. If you want long star trails, I'd probably use a single image with a much longer exposure. You can combine multiple exposures in post processing if desired. I think for the image you are sharing here, and exposure of an hour or two would make more sense. I'd probably try to have an exposure of 2-3 times as long as the total elapsed time in the posted image.
I appreciate the composition here is with a wide lens, but normally for star trails you would use a longer lens to see clear trails in a reasonable time frame. You would stop down the lens and use a lower ISO.
A wide lens is normally used for big sky images of the Milky Way or other elements but not trails. For these images you would use the 500 seconds divided by the focal length rule to calculate shutter speed, shoot relatively wide open, and use ISO to allow an exposure in the time available.