Noob here, how get hp? Please help me learn

I keep hearing that like 3k hp is the minimum you should have to run maps in the endgame. I'm currently running T11 maps and hitting a wall. I have ~1800 hp and only 235 es. I have 62% evasion and 57% armor (Monk, and took the phys dmg reduction Invoker ascendancy node) I've tried finding gear with +max hp as much as possible while still keeping my res's capped.

I have the following:

Gloves --- +61 hp, 10 str

Boots --- +112 hp

Amulet --- +56 hp

Helm --- +159 hp, 27 str

Body --- +23 hp (hard to replace, 1030 evasion on it)

I have most of res's on rings, boots, and belt. I have 70% on fire, 75% on both cold and lightning, but only 25% on chaos. I also have flipped as many nodes from dex/int to str as I can while still being able to use my skills/gear.

Is there something I'm missing? Even if I get great HP rolls on all my gear I don't see how I can get even close to 3k or more. Please help me learn!