PoE Crackling Lance, Elementalist, Spell builds

Trying to learn some more about builds and crafting and stuff and want a HOT autobomber for farming essences and harvest and possibly some delve, apart from leveling what should be the obvious upgrades or most likely mistakes I’m doing?

Hi, I've been trying to build around a Herald Thunder autobomber (HoT), using a mana-stacker approach, by combining the "Essence Glutton" necro node via forbbiden jewels (2% base mana/s) and Elementalists (1% base mana/s) from "Mastermind of discord" and Agnostic\ to sustain both life and mana. \Agnostic is provided via Sanctified relic, so it's added under custom modifiers. HoT is in the Crest of Desire to minimize the mana reservation. Build is so far decent for clearing t16 maps - the sustain is GREAT compared

Ive been working on this build, off and on, for a few version updates and I just wanted some fresh eyes on things I might consider changing up. I can run Tier 13 maps pretty consistently, anything higher tier though I get wrecked every couple of runs and lose all exp progress. Pretty simple play mechanics, all tied to logitech mouse buttons. If you have a few minutes to go through my POB set up and let me know where my weaknesses are would be greatly appreciated. Happy to answer any questions about whys and hows of my build. Note I havnt reset my skill tree, yet. Still testing what I had un

Folks, I have hit a brick wall, unable to do increase damage or survivability any further. Unable to complete red-rare and corrupted map bosses. Either I get one shot as soon as I enter arena or the boss regens more health than my dps. or (lizzandrass) Would love a review/roast of the build and any ways to improve. Have loosely followed an arc build except for some