Hello, have you heard the good news? The Large Durtle in the sky is watching over you. 
It certainly bums me out when my average is lower than I’d like it to be but that’s why we have to trust the SRS system and maybe do a bit more studying outside of Wanikani? I’ve been meaning to get started with @Leebo’s recommendation on the Iversen Method but life gets in the way so I use @rfindley’s Self-Study Script and Wanikani Ultimate Timeline instead. It has helped me keep my average in the 90ish% range.
Take it easy and don’t get so worked up. The goal is to burn turtles, not burn ourselves out. Good luck and may the Crabigator be with you! 