I think you mean sharpness, right?
Resolution and sharpness are not necessarily the same. You can have the camera set at the highest resolution and still have blurry images. Sharpness is governed by shutter speed and ISO. If you are in low light conditions, then to get a brighter image, you need to use either a slow shutter speed or higher ISO, or both. Slow shutter speed can cause blurry images because of camera shake, or the subject is moving. Higher ISO results in grainier images because the camera amplifies the signal which introduces noise, which lowers overall sharpness.
Brightness is governed by shutter speed, aperture, and ISO. To get brighter images, you need to slow down the shutter speed (which can cause blurring from motion), make the aperture wider, or increase the ISO (which causes graininess). The problem is that the Note 8 (and almost every other smart phone) has a fixed aperture lens, which means you can't increase or decrease the aperture (aka F-stop). This means you are limited to shutter speed and ISO. There is also exposure compensation (EV) which gives you +/- up to 2 stops of exposure compensation. To change any of those, you need to be in "Pro" mode (Samsung camera app). Other camera apps like F-Stop (which is not free) automatically start in manual mode.
Samsung also has a "sport" mode which automatically sets the camera at its highest shutter speed and uses the lowest ISO needed to get a "proper" exposure.
Cameras, both smart phone and "traditional" cameras have come a long way, but unfortunately, we still run up against the laws of physics and how light works. There are always trade offs.