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This is the best I've been able to get.
I started with the original. Made a duplicate of the background as a new layer. Used the Contrast Enhancement tool to up the contrast to the maximum, then made that layer 50% transparent and used the Multiply merge mode. Then I combined the layers and used the BD Grey Balance plugin to tweak the colours.
It's maybe managed to pull out a tiny bit more detail than your attempt, but there's not going to be a lot more to get from that original.