Welcome to my guide.

UPDATE:21.feb I've completed champion expeditions and I'm starting to die a lot in low master expeditions(100+ expeditions). So I might have to do several changes.
I have a completely new build in mind that is build arround plagueburst and Mark of Impurity

I wanted to create a bow character which focused on both strong basic hit damage and skill damage.
I'm currently level 71 online, and haven't encountered anything this build can't handle.
Clearing champion expedition with ease 80+
On to the guide!

Attributes

Throw everything into ferocity your attack speed will be fine without taking agility I will cover that later on.

Skills

1.Mark of Impurity: Target Elminated - (Fate of the unholy) - Defect of creation - (Strange mercy) - (Guilt by association)
2. Duskshroud: Final trick - Lapse in focus - Light's swift retraction - Ex nihilo - (Shrouded assailant) - Crepusular attunement
3. Avengers turret: Sleepless sentry - High calibre ammunition - Flak launcher - Precision bullets - Cranial focus fire - Kinetic trauma - Unstable engine of destruction
4. Wailing arrow: Force bow - Irate smiting - (The black cloud) - Shattering arrowheads - Attrition strategy - Eagle eye - Broadhead - (Vanquisher's overlook)
5. Phantom blades: Vorpal blades - Needless in perpetuity - (Bladed blizzard) - Thich edges - Butterfly's eye - Dismissal - Gutting Wheel

(Late game/Mid game) Mandatory Skill modifiers are ()
While leveling pick and choose what your prefer or what you get as a drop. I pretty much completed the campaign with just basic hit, wailing arrow and phantom blades. After the leveling the builds really start to shine, but it was pretty decent to level with. Except act 1 boss as any other build.

Gate of fate

Start of in Sentinel and get
1. Refined Technique
2. Precise Strikes
3. Backline Raider

Then we go to Ranger
1.Shoot to Kill
2. Archion’s Teachings
3. Bullseye
4. Deadly Aim
5. Swiftness
6. Swift Death
7. Safe From Afar
8. Persistence Hunting
9. Overwhelming Barrage

Then we go to White arrow
1. Wintry Hail
2. Ice Shall Wake
3. Acute Tracking

Next up is Soldier
1. Heavy Blows
2. Zealous Might

Then head over to Assasin
1. Merciless Lethality

Last stop Alastor
1. Pulse Control
2. Shock Invasion
3. Intravneous Neural Cord
4. Cautious Effort
5. Condensator
6. Static Transferal

Thereafter you can start putting in some tweeks in like:
Slipping shadow in Assasin
The wild card in Soldier etc

Link to gate of fate and how you should align it below:
https://wolcen-universe.com/builds/g1onpO-detailed-bow-guide-wailing-arrow-mark-of-impurity-insane-dps

Stats on gear

Weapon: Get a bow with frost damage
Frost damage on attacks with this weapon
increase Critical Damage
%Damage
Critical Chance
Elemental Damage
Attack speed

Gameplay

Stack and kite everything inside the instance, and then mark of Impurity on 1 mob use duskshroud and position yourself and throw wailing arrow and watch everything explode elites, bosses or whatever is inside your stack. Thus it depends on how many your are able to stack. Extremely satisfying playstyle and it reminds me of one of my all time fav builds in Diablo 3 Exploding palm. The builds has super fast clear speed if you execute it properly.
Last tip you can even put mark of Impurity and pop your r, and watch everything die and exit by pressing r again.

Before I end this guide I wanna give credit to this dude https://fextralife.com/wolcen-build-guide-white-arrow-bow/ almost the same gate of fate build, but the skills are a lot different.

Edit. Just saw this video https://www.youtube.com/watch?v=li-cQ1_RV0A&t=959s
It's a completely different build, but it does use same mechanics. And it seems like this type of builds can handle the end-game.