I know this topic is specifically for WaniKani, but as much of the advice given so far can be applied to Anki as well, as someone who is currently struggling with obscene review loads, I recommend going through the thread to find a more balanced review diet 
It’s honestly a bit of a shame that WaniKani doesn’t allow setting lesson and review caps like Anki does, because it’s way too easy for people to shoot themselves in the foot and be forced to reset levels or enable vacation mode to put a stop to the flood of reviews 
.