Noise reduction / sharpness help

[sovereign (Matteo Costa)]

You can try increasing the luminance noise reduction slider and appling some sharpening (unsharp mask).

@RawPedia

While it is generally not recommended to combine sharpening with noise reduction, RawTherapee-5.5 has a “contrast threshold” adjuster in the Sharpening tool, thanks to which you can sharpen details while preserving the smoothness of uniform, flat areas.

If you want you can share the raw file, so that people can play with it.
You should read here to explicity license your photo.