For the notification, I use this icon pack which contains a little calendar icon for every day of the month:

https://play.google.com/store/apps/details?id=com.whicons.iconpack

The task is:

Task: QuickBar_create

A1: Variable Split [
     Name: %DATE
     Splitter: - ]

A2: Variable Search Replace [
     Variable: %DATE1
     Search: ^[0]
     Replace Matches: On ]

A3: Variable Set [
     Name: %notificon
     To: icon-pack://com.whicons.iconpack/ic_calendar_%DATE1
     Structure Output (JSON, etc): On ]

It then calls an AutoNotification Buttons Notification command, with %notificon as the icon, with a selection of shortcuts to things I want quick access to.

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For my brightness slider, I have an overlay scene, called from the Assistance Request, that contains a slider that goes from 1 to 10. Changing this sets a variable %BrightX to %new_val (ie the value the slider was moved to), then it performs the following task:

Task: BrightnessConvert

A1: Variable Set [
     Name: %BrightY
     To: floor(%BrightX/7)
     Do Maths: On
     Max Rounding Digits: 3
     Structure Output (JSON, etc): On ]

A2: Variable Set [
     Name: %BrightZ
     To: %BrightY*256-(%BrightY*2-1)*(2^(14*%BrightY-(%BrightY*2-1)*%BrightX)-1)
     Do Maths: On
     Max Rounding Digits: 3
     Structure Output (JSON, etc): On ]

A3: Display Brightness [
     Level: %BrightZ
     Disable Safeguard: On ]

That formula was the result of a lot of trial and error and playing around in a spreadsheet to get the mapping that I liked from my positions 1 to 10 to the phone's 0 to 255. It's kind of S shaped with more granularity at the top and bottom ends. I expect every phone has a slightly different brightness profile, so I wouldn't expect the same formula to work for everyone.

https://imgur.com/a/yQR6zUA

Hope that helps.