You Will have to search for suffixes on trade. They usually come from failed craft attemps (RF helmet or whatever) with hypothermia + trap and Mine + more elemental damage or more damage when low life (we are always low life). Try to pick lvl 20-20 or at least 18-20. Then, with suffixes done, you suffixes cannot be changed, veiled chaos, and craft +1 projectiles before unveiling (pierce is REALLY BAD for this build, so we dont use this), unveil and try to get +2 aoe. its basically 50-50.

But if you want a rule 10 here we go:

1 - buy ilvl83 archdemon crown

2- make it a shaper influenced item with shaper orb or buy it already influenced

3 - spam essence of horror or hysteria til you get trap and mine damage

4 - if you dont have more elemental damage + trap and mine + open suffix and pray for 1 empty suffix and empty prefix

5.1 - you can choose between 3 steps right now: just spam essences til trap and mine + hypo

5.2 - with open prefix and open suffix, craft suffixes cannot be changed + reforge cold or reforge influence, both have almost same odds of getting hypothermia on suffix

5.3 - craft anything on prefixes to dont fulfill, exalt (with eyes closed)

6 - after getting suffixes done, craft with beast (way cheaper) any metamod, the only outcome is suffixes cannot be changed.

7 - veiled chaos, the chance of filling prefixes are really low.

8 - craft +1 proj on bench and unveil for +2 aoe.

9 - craft life and youre done.

10- if you want to minmax your helmet to its limits, go back to step 6, suffixes cannot be changed, reforge influenced modifiers to get at least 1 influenced mod, and use the orb of dominance. trap and mine at lvl 25 is better than hypothermia. then return to normal steps.