For your Interface I would recommend using Weakauras and Bigwigs.

/use 14 /cast Combustion the /use 14 slot is for bottom trinket, 13 is for top trinket. This macro would cast memory of lucid dreams, then use manifesto, then combustion. Also I am not sure why you would want to cancel out the crit buff from manifesto.

Weakauras will give you the opportunity to import a lot of helpful stuff to keep track of your cooldowns, buffs and debuffs.

BigWigs for having a boss mod helping you out to plan our cooldowns ahead of time and be prepared for certain abilities that are about to happen.

Macros

Here are some useful Hunter macros everyone should have:

Trueshot, Trinket & Berserking Macro

Macros can refer to different slots with those numbers. 13 is the top trinket slot. 14 is the bottom one. So instead of '/use Bloodlust Brooch', just do '/use 13' if it's in your top trinket slot. Your macro could include '/use 14' as well so that you automatically use the second trinket when the trinket cooldown finishes. Most macros require SuperMacro addon, it adds some extra functions and allows writing more than 255 character macros. If a macro isn't working, double check that you copied it correctly and got all prerequisites. If all looks well, open an issue, try to write as much defail as possible. Generic Use Healthstone Root Tuber (Supermacro).

If you have a trinket which cooldown lines up perfectly with trueshot, you use both at the same time. This just gives an extra action bar slot for anything you want. In case the trinket is out of cd and trueshot is not, you just press the macro to use the trinket.

Resonation Arrow Macro

This is for any spell that has a target reticle such as traps, flare and binding shot.

Aspect of the Turtle Cancel Aura

You're unable to cast spells while being in Aspect of the Turtle so it might be useful to cancel it sometimes.

Macro Use Trinket

Misdirection Mouseover or Focus Macro

Misdirection is an important ability in Dungeons but also in Raids: This macro will cast Misdirection on the target you are currently mousing over. Otherwise, it will cast on your Focus target.

IT'S IMPORTANT FOR BM HUNTERS TO USE THIS MACRO FOR EVERY OFFENSIVE SPELL

The auto-cast system in the game is super slow on pets and you might miss out make sure to use this macro.

Another important topic is the pet attacks, you should macro them into all of your abilities when you're using a pet to guarantee the pet will use them on cooldown and not miss out on damage.

Here is one example for Barbed Shot. It is recommended to macro these into every important ability while using a pet.

Some auras that I find really useful are the buff trackers, such as for Trueshot, Precise Shots, Posthaste. If you are hiding your action bars as I do, Aimed Shot stacks and any cooldown tracker is also really good.

Apart from class/spec specific WA you can also track Combat Meditation and Let Go of the Past.

Afenar does some really good WA so you can check him out at https://wago.io/p/Afenar or you can find a wide selection of Hunter auras at https://wago.io/shadowlands-weakauras/classes/hunter.

Shadowstrike Macro:

Uses [Backstab] or [Shadowstrike] depending on your stance.

Shadowdance Macro:

[stance:0] prevents you from accidentallyactivating [Shadow Dance] twice.
/cast Shadowstrike prevents you from accidentally using [Backstab] after activating [Shadow Dance].

You can add this 2 conditions if you want to, [Specter of Betrayal] or any other on use trinket is usually lined up with [Shadow Dance]. [Symbols of Death] gets usually used pre [Shadow Dance]. This means this condition will never trigger but would allow you to use [Symbols of Death] together with [Shadow Dance] during the animation.
it's still recommended to use 2 macros in case you don't want [Symbols of Death] to line up or if you don't want to use [Shadowstrike].

Marked for Death / Death from Above Macro:

Uses [Marked for Death] or [Death from Above] depending on what Talent is used.

Same but with mouseover for [Marked for Death].

Vanish Macros:

My personal version of the macro, prevents you from accidentally using [Vanish] when out of combat.

Nightblade Mouseover Macro:

Use [Nightblade] on mouseover, uses nightblade on the target if no mouseover exist.

remove @target if you don't want the macro to only work on mouseover.

Shadowstep Mouseover Macro:

It's often quite nice to have the option to [Shadowstep] a target via mouseover during a fight.

Classic Wow Use Trinket Macro

Item slot Use Macro:

Use Trinket Slot Macro Wow

Uses the Item slot, can be used for Trinkets, Rings or Engineering Enchants.

Item slots:
1 - Head Slot
6 - Belt Slot
11 - Ring Slot 1
12 - Ring Slot 2
13 - Trinket Slot 1
14 - Trinket Slot 2
15 - Back Slot

Tricks of the Trade Macro:

[Tricks of the Trade] on the Main tank.