Hello, I'm returning to Diablo 2 after a long break. I've started as a Warlock, currently level 80 with a drop shako, an etheric shield with insight as my weapon, and the rest of my gear is pretty basic. I'm wearing Hel Shael armor with ral, and my resistances are quite low with 1300 HP. I'm very fragile and die very quickly in Hell. What would you recommend I prioritize buying?

I'm playing Grim with the Echoing Strike attack.

Thanks in advance!