All aboard the WK train journey. Welcome welcome to WK ascraig101!
Personally, I think what you are experiencing is normal. Like what others have said, I would not call it a slump. Some items just do not stick as well as others. Maybe you can look at the stuff you keep getting wrong and try to differentiate them from each other? I have several of these that at first glance to me looks really alike. I then determine what I am confusing it with and oftentimes you can quickly see the WK radical that differentiates the two.
I also second those that have advocated consuming other forms of Japanese, not just WK. Find a Japanese comic or a children’s book, try reading through a webpage in Japanese and see what you recognize, maybe you can start a Japanese language textbook? What about watching a Japanese show or anime with Japanese subtitles on?
Just some thoughts. Part of me sincerely thinks this is just a minor setback and that your brain will reengage itself again to a higher accuracy.
All the best on your language journey!
keep chugging along and things will be alright!