- The level 30 syndrome
Welcome. You’re halfway it. I’m so proud of you, I really am 
You’ve done what thousands before you didn’t. Literally:
Observation: Graphic kindly made by @Kumirei.
You’re not over though. There are still 30 levels left to conquer. According to data, an average of 6.8% of users will “stop” on a level (assuming everyone stopped right now, which isn’t totally right). Don’t relax too much just yet
Observation: Graphic kindly made by @cpitman.
The First 30 ≠ Last 30 Principle - Remember? *
If you’ve read Chapter 6 of this Guide (if not, please read “The First 30 ≠ Last 30” part), you’ll know how I explained that the first 30 levels have a much bigger impact on your learning, compared to the last 30. However, I also explained that the last 30 levels can still have a significant impact, so they’re far from neglectable. This is a key problem though: the gains from the first half are so big that even if you continue seeing results during the 2nd half of your journey, it’ll feel like too little and you’ll almost definitely lose motivation. The fact that after 30 levels, you’re so good at WKing doesn’t help. You lose the momentum you once had because you’re so used to this program already. It feels like climbing the same staircase over and over again: you’re going up, but it’s still the same staircase. It’s no longer a new challenge.
It’s time to find another challenge - You’re too good to do just one.
Exactly what the title says. Your passion for the Japanese language isn’t going anywhere. You’re not done with learning either. So go find a new challenge, whether if it’s joining the book clubs here on the forums, whether if it’s finding Japanese friends, whether if it’s dedicating more time on grammar, whatever you wish to accomplish. Don’t leave Wanikani behind, however. Use your solid routine to continue with it until the very end (you can do it! o/), but in case you find yourself losing momentum and staying behind, know that it’s time for a bigger challenge