Congrats!
Another struggle with WK that becomes more obvious on higher levels is visually similar kanji. I wish WK would provide some tools to help with those. Perhaps if I confuse meaning of a certain kanji with a similar one show them side by side so that I can clearly see the difference right during the review session?
A bit late for you (and I know you said you didn’t use scripts) but I’ve found the ConfusionGuesser script by @Sinyaven to be really helpful for this. I agree some type of first-party support for attacking the visually-similar problem would be welcome though - if they took it on I trust Tofugu would come up with a quality approach.