need help fix my dps so i can leveling in red maps without worrying to be killed and losing 10% exp

my sirus full dps in pob is 545,654 and 3,757 hp 1,436 es with es-hp leeching lv 91 but still cant manage sustain es leech from every thunder tick https://pastebin.com/N9QH3f5b

can you please help me fix my build for increase my dps? its herald of thunder auto bomber with conductivity aura for passive cursing and clarity for mana regen that is why i cant have calamitous vision becouse yes it double my herald dps but i wont be able passively curse mobs and would need mana flask for keep my mana for cast storm brand its 10 ex budget and yes i know that my support gems very suck but i need both life and energy leech support for sustain both storm secret rings and 6l agnerod south and impulsa broken heart cost 2+ stacks of exalted and i also having hard time rolling right colors

i following this guide https://www.pathofexile.com/forum/view-thread/2891996 but insteed assasin wanted pick elementalist so the skill tree was inspired from this outdated necro build https://www.pathofexile.com/forum/view-thread/2909720/page/1