Interface
In Midnight, Addons have been restricted in what they can do. When the addons that become the most useful are more stable, this section will get updated. But in general, it's important to make sure you can track everything you need to for the boss fight or dungeon.
For example, the image below shows my own UI:

Macros
Coup de Grace on AoE Macro
You can fully automate the usage of Coup De Grace on AoE with the following macro.
#showtooltip
/cast Coup de Grace
/cast Black Powder
Shadow Dance and Shadow Blades Macro
Just a simple macro to use Shadow Dance and Shadow Blades at the same time.
#showtooltip
/cast Shadow Dance
/cast Shadow Blades
Tricks of the Trade Macro
Simple named Tricks Of The Trade macro that I use for both raiding and M+. All you have to do is right click the frame of the desired target and press copy name and slot it in where it says “NAME”
#showtooltip
/cast [@NAME][] Tricks of the Trade
Mouseover Shadow Step Macro
This is a mouseover shadow step macro that allows you to just hover the desired target to Shadowstep them. If no mouseover is found, it will just shadow step your target instead.
#showtooltip
/cast [@mouseover, nodead, exists][] Shadowstep
Kick Focus Target Macro
Just a macro that Kicks your current Focus target.
#showtooltip
/cast [@focus][] kick