Since you didn't mention it, is it safe to assume this was unguided?
I think there are a few areas you could try to improve upon here. The first thing to look at is focus. Notice how large the stars are, and how blurry M33 is? These are pretty strong indicators you were out of focus. Unfortunately, there's nothing you can do to fix focus issues in post.
The second thing to look at are the star colors. See how virtually every star is completely white? This means you've clipped the highlights. If this was done in post-processing, you can do things like masking out stars to not stretch them so hard. If this was done while capturing the data, this means you need to look at your exposure settings. Try exposures of 30 seconds instead of 60. I don't use APT, so I'm not sure what level of detail is shown when taking subs (like min/max ADU, median, histogram, etc). If you have a histogram, you want it about as close to the left hand side as possible without touching.
While we're on colors, notice how the blacks are REALLY black? This is because, like with the highlights, you've clipped your shadows. You've dragged the black point way too far to the right and lost a whole bunch of data.
Finally, I'm not sure what filter you were using, but the general recommendation is to _not_ use any light pollution / CLS / L-eN, L-eX, L-Pro filters on broadband targets like galaxies, reflection nebulae, star clusters, etc. The solution is to either a: go to a dark site (which may not be possible) or b: take a lot more total integration time.
So, to answer your original question, no, I don't think the image is "about as good as it is going to get with this sensor" .