I’ve encountered this situation a couple times throughout my short time on WaniKani, and it’s usually because I’m overworked or tired. I don’t give myself enough time when I’m well rested and awake to study. I’ll just take my time and rest for a bit and come back when I’m feeling better. I don’t do reviews or learn anything new when I’m tired or know I’ll be tired when the first reviews come around.
I feel like the first two review sessions are the most important to learning, so make sure you can do those right as soon as they come in. I’ve noticed that if I wait a few more hours (or am not able to access WaniKani for those hours due to work or whatever), I have a VERY hard time remembering what I learned. If I do the 4 hour and 8 hour reviews IMMEDIATELY when they appear however, I usually get around 90-95% right and don’t have too many problems remembering. The items that I didn’t review immediately when fresh have come back to haunt me… Most of them ended up back in Apprentice even after hitting Master. ^^"
Try to focus on remembering the radicals to the Kanji… I also sometimes have a tendency to try and remember them by shape and balance. This presents a problem with similar kanji, of which there are many. For example, I had problems differentiating between 湯 and 陽.
Other than that, just keep trying and keep your spirits up! It’s going to be difficult but you’ve already come so far! You’re almost 2/3 of the way through! All difficulty can be overcome with time.
Best of luck!