When you preview your scene with NVIDIA, there is a tiny icon which will automatically sample one or more pixels in your scene and automatically adjust the lighting (tone mapping) of your scene so it is brighter or darker. It doesn't always get it perfectly right, but worth a try. You click on the icon (see image below, circled in red/purple), then you can either just click one spot in your image with a quick left click, or you can draw a box around an area (click and hold left mouse and draw a box) and it will sample all the pixels in that box and adjust the lighting accordingly. You only see then when you select NVidia...
View attachment 2577630
Of course, you can also adjust the tone mapping yourself manually. I will usually use the above icon, then I will manually tweak the tone mapping myself a little more using the slider below. To get it you just go to your render settings tab and there's a tone mapping settings there. I usually just adjust the Exposure Value slider a little and that is usually enough...
View attachment 2577636
And even the camera's headlamp can be useful for quick renders. You can adjust the camera's lamp position and move it around so it is higher, more to the right or left and even brighter or dimmer. It's not ideal, but if it's just a quick render, it can be handy. The offsets below are the headlamp's position relative to the camera. The intensity is how bright it is, though I usually leave that alone and use tone mapping for my brightness etc...
View attachment 2577644