I finally did it! After a bit over two years, my last lesson in WaniKani is here and it’s the most appropriate one you could hope for:
Congratulations! 
May this victory not be your final one, but just a prelude to your future Japanese victories! 
P. S. I noticed that you’ve never posted here before… When I joined, I too planned not to use the forum until I reach level 60… But ended up abandoning that plan. It’s cool to see someone actually managed to do this!
Although, this commeownity is so meowgnificent, it would be a waste not to use it… I’m glad you finally wrote here. Welcome to WaniKani Community! 
Congratulations for your achievement 
That is wild, and congrats! And welcome!
おめでとうございます！
FINALLY! Congrats, welcome to the top of the mountain! 
-Nick at WK
Congrats!
Seeing several first forum posts in the level 60 thread. 
Congratulations!! And welcome! 