Your focus looks really good on this. I think you need some more data to tame some of the background noise. But despite that this has heaps of potential. I can see some color in the Ha region sjust wanting to come through and I think with the right processing you could bring that out.
Also you should be able to reduce those magenta rings on the brighter stars with a decent mask in Photoshop and some use of color balance or hugh saturation tool.