I’m following Valkoria’s build, with a little changes in skill point allocation in the Cryo 3. Currently level 230 with all circles, except for Rune Caster’s at rank 8.
What people usually go for between Cryo and RC is Psychokino. The main reason for this is for the ice wall + rune of ice + psychic pressure combo. I’m on mobile right now, so I can’t link you any videos, but a simple YouTube search should give you some results.
The Psychokino build is mainly a one trick build, that melts bosses. Valkoria’s Cryomentalist build is for the interaction between rune of ice, and cryo and elementalist’s skills to have 150% more damage on ice skills. The main goal for that was for the insane damage of ice wall + ice blast combo (again, YouTube has videos), but that combo was nerfed recently.
TLDR; Valkoria’s build was nerfed, but still works, it’s just not a 1-button kill class anymore. CryoKino build still works well, although it’s a 1-trick burst class with long CD.