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AutoHDR free download: Exposure adjuster software for Windows. Safe PC download for Windows 32-bit and 64-bit, latest version.
It's a simplified tone-mapping app that is very easy to use, and will often bring out details in photos like yours. Give it a try. It's not really HDR, but it will increase the dynamic range of your images. Use the "default" setting and take a look. There are lots of things to explore, including a way to get true HDR results, requiring multiple images taken at different exposures. It does a pretty good job.
You should be able to get an f 1.4 Nikkor on Ebay for a reasonable price. A 0.9 lens might be located, but you wouldn't like the lack of sharpness.
Like most Nikons, yours has superior high ISO performance, so you'd probably be better off cranking up the ISO to 12800 or so and you'd still get good results. Faster lens will give you two, maybe three stops more light than what you have now, but a higher ISO can give you usable results with five stops improvement over ISO 400. At least your camera will.
I have super fast lenses for my camera, but I really never have to use them.
Ah. Then just take longer exposures. Reciprocity failure isn't a thing with digital cameras, so it's pretty straightforward. Moving objects are an issue, but your real talent seems to be architectural subjects, which don't move much.