To the level 60 heroes

I think that if you are motivated enough to reach level 60 on WK then you are probably also motivated enough to start learning grammar.

I’d say: learn some basic grammar and join one of the book clubs (Absolute Beginners Book Club // Now reading: Hunter × Hunter or Beginner Japanese Book Club // Now Reading: 耳をすませば) and you might find out that you can read sooner than you think!

I’m nowhere near level 60 and only did a bit of grammar studying, but by working my way up through the book clubs, I’m now almost finishing my first novella in Japanese and halfway through a full novel (and reading a bunch of manga) so in my experience you can pick up a lot just by reading and participating in the clubs.

Like the others have said, you’ll be looking up words in dictionaries for a long time to come, but the more kanji you know, the easier that gets because you’ll know the readings without needing furigana.