The first shot is with Auto White Balance and standard Portrait picture style settings. Here's an example I shot a while back of a band performing under limited spectrum LED lighting. Increase the contrast and all of the dark areas of the picture start going very dark again. That forces you to increase brightness to the point that almost all contrast is lost. In the case of lighting that is very limited spectrum, such as appears to be the case with your purple light, you have to throw almost all of the light in the JPEG away to even get the color anywhere in the ballpark of realistic. You can't add the parts that may have been in the raw data but were discarded in the conversion to JPEG and are not contained in the JPEG image. The problem with trying to change white balance with a JPEG is that you can only take away the parts of the color spectrum that you don't want that are contained in the JPEG. If all of the information contained in a raw file were available, it could be corrected to a much better degree, but much of the information needed to fix the image was thrown away when the file was converted to JPEG either by your camera before saving the file or by you when you edited and converted the file later. Here's the best I could do with the JPEG you uploaded as a starting point. The relatively bright sky in the background fooled your camera's Auto White Balance into thinking that is what needed to be the correct color, not the much dimmer part of the scene in the foreground. when the light source is of such a limited spectrum as appears to be the case here, you need to add more light that covers a wider portion of the visible spectrum. You need to adjust for the color temperature of the light source.
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