At first glance, the units seem to be missing something. Perhaps it is a sense of cohesion. Let me explain. Before the new updates, you would have been missing a lot of leadership, with only Hrimm giving Inspiring to Frostbound only. CoK upped the anti on Inspiring, which is a blessing for Northern Alliance, but even so, you lack Inspiring models/units. The only other hero you have is the Ice Kin Master Hunter, which for some inexplicable reason doesn’t even inspire Ice kin hunters, of which you have none by the way, and they are a really good unit.
So, firstly, i would consider investing in a few heroes. An Ice Queen would both add Inspiring (very inspiring in fact) and give you spells to push the Ice Elementals up the field.
Which brings me to my second point.
You need too look at units that compliment/support each other, to get the best out of your army. For instance, i run an Ice Queen, with Surge, along with Ice Elementals, and Ice Naiad horde, and complement this further with Ice Kin Hunters and /or bolt throwers, to further complement these units. In this way, the Ice Queen serves multiple roles, an inspiring character, a spell caster to the Elementals, and also, can get a reroll on her spells, as Master of Ice, if she aims spells at a unit already hit during the shooting phase, so either from Hrimm, the Ice Elementals or Ice Kin.
And these same units protect the queen, who is utterly useless in combat.
Similarly, the Tundra Wolves are awesome, but can be protected by a buffer of Snow Foxes, to get them up the field and into combat.
The Half Elf berserkers are really good in combat, but poorly armoured, so need a buffer to get them close. Dwarfs or Clansmen , or even the snow foxes can help protect them as they get within charging range. They, and the Huscarls, will be targeted as threats, as both can be scary in close combat. and incidentally, don’t benefit overly much from upgrading to Regiment size, rather than two troops.
incedently, i actually got a cavern dweller yesterday for my b/day, but i haven’t played him yet, so i’ll reserve comment on him. However, he too would be a target for missiles, so the Snow Trolls might be of benefit in a formation to protect him.
So, just to recap, when setting up, think about formations, as well as individual units, and ways to get the most out of whatever you have in order to benefit the mission objectives of that game