From my experience, learning grammar required kanji along the way. I regret wasting time like that.
I came back to grammar at about 14th level and it felt like magic - I was 100% focused on the grammar patterns and (most) kanjis seemed as natural as English words.
Lots of people share their experience - you can start looking through them after you have a feeling of WK (at least 4 levels, I think).
Here’s my humble compilation: Forecasting Reviews on the Dashboard - #295 by Cumva
Good luck! 