You clearing 3 maps without any CC-ed units is a miracle by itself.
CC = Class evolution.
It used to stand for class change but when nuktaku came over they decided to change the name but the previous wording sticked with fans.
Dont both with anything else other than power leveling your units.
You NEED your core team before you can choose what units to expand on for various map changes.
Lets go step by step. Get your main archer (bashira) to 30, then your soldier (katie) to 30, followed by healer (iris).
Now focus on your magic dps for armors -> mage (sasha) and witch (cloris)
DON'T FORGET THESE UNITS, THEY ARE YOUR CORE TILL YOU AT LEAST 120 OR IF YOU BURN 200 BUCKS ON THE GAME.
READ THOSE NAMES AND GET RID OF YOUR IRON/COPPER UNITS, WHY ARE THEY LEVEL 30 ROFL.
Since Lee-ann is your only Heavy armor, i suggest you get her into your core team as well.
Once they are all 30. Focus on one to get 50 and CC-ed. I will recommend bashira because she can be drop pretty early.
Once bashira is 50CC30 -> meaning once she is maxed at 50, then CC-ed, she will be lvl 1 again, bring her to 30.
Move on to all other units of your core team.
This whole process should take you 2 weeks if you are lucky/smart to 2 months if you are unlucky/not so active.
Check out the beginner guides, they'll help you alot and find videoes on youtube which show you what units are mostly used for maps.
Dont EVER level an iron unit again. You got some pretty good plat units you can focus on. Do that.
PS: Give aff only to those units. My eyes burned when i saw your unit list.