Am I missing something? Mana Stacking Chaos Archmage but my dmg feels very low

I have 5.2k mana (normally overflowed to ~8k)
My gear is good (i think?) but my main skill (fireball) is still only doing around 25k tooltip dps (against bosses id estimate i do around 50-60k with procs and such).

Its a bit of a silly concept - Blackflame covenant CoEA Chayula monk.

https://poe.ninja/poe2/profile/OishiiJade-4287/character/TeiShii


I have wither and shock, sigil of power etc but im still fighting map bosses for 5+ minutes each (i dont want to one-shot, but this is too slow!)

Am I missing something obvious that would help my damage? Please help! Its sorta miserable despite all my efforts to make it work..

First off check your weapon. It is the primary means of increasing your damage. After that, Chayula and Chaos damage are both in a pretty bad place right now. I don't know all the current issues, but your best bet is to look at comparable builds on PoE2 ninja website. You may find some more advanced versions of your concept there.