Hello. i was a cold only sorc things worked pretty well but i was found that it impossible
( with my current fcr ) to do valley of snakes and other places that have plenty of cold immunes
so i used my last reset to do fire/cold build. now im too weak both on blizzard and on fireballs
and with that i put more points to strength to hold my spirit shield so every hit is reduce my to half life.
what should i od ?

Don't go cold immun places

get a token

If u got Hybrid Energy Shield is a must
then when u skill fireball / and blizzard you go more into fire stats and use Cold sks

Talrasha Eq with shako and merc uses Strong armor + Lifeleech helmet ( maybe the tal u dont need ) + the ETH Insight with 17 Meditation is must in eth strong weapon.
Energy Shield highly recommended

I have sp sorc fireball/blizz and works fine. Dual spirit, lore helm, enlightenment armor, +1rare Amy so +8. Magefists.

Merc: reapers till, treachery, gaze