System app BrightnessBNR is the one you want. It keeps all the calibration data. Force stop then clearing cache and data on that resets the adsptive brigtness.
Go to settings then apps. Click the icon at the end of "your apps" and tick show system apps.
Then scroll down to Brightness BNR, click force close then go to storage and clear cache +data.
Then reboot your device and it will have reset the brightness calibration as though it's a new device.
Well if you had read my post above properly it told you how to make the system apps appear
I reset it every month or so, but I guess it depends if your preferences match the algorythm.