This article: My Journey of 368 days (+ The Ultimate Guide for WK 📖 ) - #2 by jprspereira helped me to understand how everything works and what I should be doing. I focused a lot on making all my lessons as soon as possible, even if it leaves me with a lot of reviews for the next day, since the last step for guru in the kanjis requires two days, and you might have completed everything but 5 kanjis are keeping you from leveling up.
Also, I’m using ConfusionGuesser, Wanikani JLPT Indicator, Wanikani Lightning Mode and Wanikani: Progress Percentages.
The progress percentages is great for motivation, and the lighting mode makes the reviews a lot faster.