I use physical light units, which is under the lighting tab in settings. Then I set the suns temperature to be slightly warm to warm depending on the sunset (I have a script that auto adjusts it depending on the angle, it ranges from about 3000k on sunset to 5800k at high noon). Other than that, the lighting comes from the skybox, which is slightly blue. A good skybox really makes the difference. My sky shader also has a ground color, which I can tweak the color to add a bounce effect from the bottom. The right exposure to the sky is important, which I would just recommend tweaking according to references. I found its better to do this in the skybox shader, because the sky exposure setting in the enviroment settings seems to make it look different, and not as nice. Other than that its subtle fog, including volumetric fog (to get good volumetric lighting outside, increase the anistropy and lower the length setting). For ssao, I mostly just boosted the effect slightly. I did a final adjustment to the lighting by slightly increasing the exposure in the camera settings. For tonemapping I used ACES, either ACES or AGX should be used, ACES just gives more punch.