DONT start over,, just leave ice for what is is and play one..
go full str,, and lvl ur fire till its better than ur ice,, best thing 2 do is skill point farm (means u should leave ur mastry like 4 lvls below ur own lvl)
gor just for fire fore a while, when u think u have enough sp and u think ur fire is strong enough, then go lvl light,, DONT START OVER DONT DELVL ICE, u can keep ice for ur buffs,, and de lvl it when ur like lvl 50-60 what ever...
GL HF