if you don't have an actual deadline, i'd take a break from your EP honestly. mixing usually turns out better when you do it in shorter sessions, and sometimes to let songs grow its important to let yourself grow, too.
that doesn't have to mean doing absolutely /no/ music at all, though. personally i get stressed tf out that i'm not making music or doing design 24/7, so even when taking breaks from larger projects, i end up making stuff. maybe make some small sketches to clear your mind, blast your EP in the car, listen to a LOT of different music, or just mess around on an instrument. you could even join in on the
forum's weekly beat cypher!! or don't do any music for the week, whatever you think you need.
once you have some perspective, maybe you can figure out what exactly it is about the project that you want to change, instead of just wanting to give up.