based on someone else’s meme that i can’t find anymore, RIP
As others have said, once you’re level 60 on WK, you can just learn Kanji as you encounter them in texts, for example using Anki or another SRS.
People actually made “fake levels” up to 70, but even without these, there are more than enough resources for extra kanji to learn besides the WK/Joyo kanji.
