Looking for input on the following build.

I filled in a passive tree and added the mandatory items I know of. I'm going for a Low Life Occultist that uses cyclone+CoC+cold dot. From how I picture this...

1. cyclone crits and causes cold snap to proc. cold snap generates frenzy charges. (inner conviction on passive converts frenzy to power charges which boost all spell dmg).

2. I hand cast vortex which is the primary damaging spell in addition to cyclone.

3. Cospri's Malice auto casts ice spear, frost bomb and vaal ice nova.

4. I've taken 2 curses - frostbite and elemental weakness which are auto cast by blasphemy, and reduced mana for this with enlighten.

5. I run 2 auras - hatred for more cold dmg and precision for crit and accuracy for cyclone.

6. molten shell, vaal discipline + increased duration are cast on damage taken.

7. Frostblink for mobility

I'm positive this is lacking in many areas and would really appreciate it if you could help me with what I'm missing. For example, I'm not sure how the defenses stack up for softcore. I'm pretty sure I don't have enough mana for half of the above and would like to go CI /low life character ideally...

This is my first build so go easy on me.. Thanks in advance

https://pastebin.com/HknzT0rj