Nice photo.. this is my go at editing your shot.. It was first tweaked in Lightroom then 90% in affinity photo. There is the before/after pic and a screen shot of some edits used in affinity.
I've uploaded a quick attempt at editing the image with two slight variations in tone, is this the kind of developing you are referring to? I used a combination of various features and techniques, some unique to Photo, to achieve it.
One video tutorial you might want to look at in particular is Creative Painting - it covers how to bring out colour and tone, especially in low light imagery.
Regarding the practical side of the photography, you may want to try evaluating your focus, as the image is slightly soft. What focal length lens were you using? There's nothing specific in the EXIF data, were you using a manual focus lens on an adapter? You can probably switch to the camera's live view, raise the ISO and zoom in to the frame to really fine tune your focus. If you're using a lens on an adapter and the focus is set to infinity, you may find you can get sharper results by just pulling the focus back a tiny amount so it's not quite at infinity.
I would also look at trying some longer exposures in order to lower the ISO and increase the aperture if possible. If lowering the ISO isn't possible, try shooting several exposures and stacking them to reduce the noise. Again, for tutorials, check out Stacking for Noise Reduction and also Maximum Stacking for some additional ideas with long exposure/low light photography.
Unless I'm missing something on Vimeo, I haven't seen anything from Affinity on developing milky way photos, which I assume is kind of a common task. It's also something I'm terrible at so far, both with Affinity and Rawtherapee. So I'd love to see an official video, or even a series on developing milky way shots to bring out the color, and developing astro photos in general.
