So what do you think of bitcoin block halving? My Antminer U3 used to make $25 USD a year now it only makes $12 USD. And EoBot fee have when up to %75+ so now 72 GH/s now only makes $5 USD a year. I never got to hit ROI, I need to mine $75 USD to hit ROI, so far I only mined $26 USD. I was hoping to at least to hit ROI and now I won't 
If you are making 5 USD a year then after 4 years you will earn $2.5 a year, so the ROI will not be reached if the price does not change. If i were you i would stop mining with that U3, buy another mining rig or quit mining completely.