PoE raflikz builds

Hello, I am currently trying to play as aurastacker (first time) and i think i dont understand mechanics, because when i watch streams highlights, many ppl got much better dmg and surviveability with worse gear, what am I doing wrong? In maps i die often to multiple hits, 88% all res, 30k armor and 30k evasion and i feel like paper. Is there any way to fix it "cheaply"? What would be next big upgrade? (I know Voices 3p, what else?) Thanks for help in advance.