PoE Witch, Hex, Bossing, Mapping builds

I thought i was fairly capped for endgame content but I can't do past Wave 20 simul, uber atziri (oneshot by every ability...), ubers, Feared, and die once in a while in juiced t16s. Did a 80% deli but 100% is out of reach. Oneshot every 5 seconds in rank500 tota (lucky I'm finished with all tota challenges for the league). Any advice on where to go from here with 40~ divs? Original plan was Forbidden Rite but MBs are too expensive this league. Could I finish 40/40 with a BV, poison SRS, or similar? Doom is great fun and all but it can't do the content I enjoy d

Prices estimated by looking at or purchasing similar items listed 1 month ago: Budget Version ---- Stats listed in approximate order of importance for each slot Shield: 10c Life, Resistances, Block, ES, Dexterity We DON'T need spell damage Wand: 5c +1 spell is best, +1 chaos very much fine, +1/+1 is BIS for wand Get +2 Gems, Fire DoT muli, DoT multi, increased Burning damage, increased fire damage I think +1 gems should be most important, but a very high Tier 2 or better Fire DoT might be as good if you can't find any combinations above Nice to have: crit chance, cast speed, mana, mana r