Forum:Who to use???

Im having trouble thinking about what units to maximize. MY mono units vary

for my fire squad : fire king vargas lvl 58

fire god lava lvl 66

master lorand lvl 57 and freya lvl 51

water: 2 ice queens salena lvls 46 and max

dragon hero zephu lvl 58 and lochness lvl 31

earth: god bow lario lvl 49

great golem lv 54

nature god lance lvl 42

brawler nemia lvl 35

light: holy knight atro lvl 52

holy queen luna lvl 44

legendary jona lvl 45

great sage mir mir lvl 39

thunder: sky legend falma lvl 53

sky emperor grafl lvl 25

dark: shadow oboro maxed

black magress lvl 58

i have other week units but these are my main ones who to train more confused???