PoE Witch, Nova, Mapping builds with custom stat filters

Here is the current character. It's shock nova ignite elementalist: I also have kind of a"dream" POB that I came up while theorycrafting before actually making the character in game: The build works pretty simply, just map with shock nova by running into a pack or nearby and cast flammability + shock nova to ignite basically the whole pack. Clear supported by fire mastery explode and maven boots. For bosses I throw fire traps as well. I think I'm dying due to repetit

Leveling Tips Act 1 - 5 Rush Elemental Overload on skill tree, if needed pick up Health Mana nodes on right side of witch starter area, i go for life on top right first then branch left to templar area. Buy Minion damage / Infernal Legion support in Act1. Socket in Summon Skitterbots in Act 2. Also optional to level Spiritual Aid during leveling to boost both your and skitter DPS then respec out of it later. On lvl 28 equip 4L Vortex + Deadly Ailments + Cold to Fire + Ignite Prolif

I made my cold dot occultist It is a pretty solid build. Which can easily farm most of the content. But I cannot complete ubers except uber shaper. I have 89 all resistance(thanks to +2 cold max resistance from a relic) 90% physical resistance. Damage is perfect for mapping. Even ok for 100% delirium. But it feels a bit slow on ubers. Now, I am trying to find a way to improve my DPS without sacrificing survivability. And sadly, I am out of ideas now. If someone has any suggestions for 50 divines budget I will be reall