-70+% how should i optimise?

hi guys. need some help from the season STMers!
i’m currently working on a $0.50 app install offer targetting a non-eng country that i’m pretty familiar with. decided to go with 3 angles 3banners each.

i ran 3 campaigns, wifi(wanted to split them up but didn’t by mistake), carrier/site and carrier traffic, i got 1 campaign running at -70% ROI so i kept that and cut out 2 other campaigns at close to -100% after $15 of spending.

noticed that 1 angle is doing alot better than the others, 3 out of 4 top converting b ...