DD beginner seeking some guidance

Hello,

Long story short: I wanted to farm some simuls/deeper delve so I picked some builds on poe ninja depth ladder and tried to get similar stuff.

I ended up with this: https://pobb.in/xQyV7T0zKqBG

Tried some content like guardians, shaper, architect (depth <150), simul. And I noticed I really lack dmg. I believe my survivability is okayish. I failed simul at wave 26 or 27. Took me 10 mins to deal 1/3 of boss dmg at that wave.

I do not really know how this DD stuff works exactly and how to configure PoB for that (side question: why do ppl use desecrate while it seems unnecessary to me?).

What I know, however, is that Reddit knows for sure. So I'm kindly asking you to help me upgrade my character.

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I am thinking of the following upgrades:

- minion wand (or should I go scepter?) with faster ignite implicit (pricey! and dont know how to craft it having a bare base)

- watcher's eye with faster ailments while affected by malevolence (rather cheap, but unsure how good)

- some medium cluster (blowback, what else? What to drop on tree? Maybe just need to level up a bit?)

- helm enchant (40% DD dmg I guess)

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What would you guys suggest?

Maybe you see any mistakes in the tree/build that I should fix (not necessarily dmg related).

Your help is appreciated, TIA!