I can't stay alive. gear, build or just lack of mechanic skill?

I tried and failed at uber lab 6 times today, got 1 shot at stage 3 of the fight twice.
also failed at the elder fight. 6 deaths at stage 1.
I even die in low tier maps.

I capped my elemental resist. I tried to put hp on every single piece of gear.
picked up most of the hp nodes on my passive.

I have artic armor, grace, cwdt with tempest shield linked blind and phase run/blood rage. cwdt with immortal call and temp chain. shield charge with fortify

Basically, whatever defensive step I can think of. But i just can't stay alive.

I used all my currencies for my current set up.
what should I do? please advice

please take a look at my current setup

The Poison setup?

If thats the build we are talking about everything looks pretty ok you should have a decent amount of life. Only thing i would suggest is for a big boss like that.... Flurry man.

Thats probably your answer. And with Izaro in particular one thing you want to do to make him super easy on a build like that... drop shield charge for whirling blades... For me anyway its so much easier to WB behind him on his big wind ups so you can get your work in and ready for him to turn around with another big windup and again WB behind him and its easy cake walk from there. You can of course still do this with Shield Charge but you have more risk of SCing right into the fucker and end up right in his face on his windups.. Which is where you get one shot from. You should be able to use this tactic and drop him in each phase by his second windup easy.

I love ST and with GMP/Slower boss swap it can work well for single target damage but unfortunately only on certain boss's while theres quite a few boss's in maps that ST just doesn't work as well for. And for those things theres Flurry. Izaro happens to be one of those where Flurry just makes it so much easier over Slower Proj ST.

I personally dislike flurry myself but theres just no denying its damage. Theres also Molten strike but then you would be needing to change shit on the tree and all that shit Flurry is litteraly a gem swap. And one you dont even need to recolor for.

Also check your elreon table to see if you can master craft Flat Chaos on your rings yet.. Pretty ok damage bump there. Hope this helps a bit.