I only read the first post, hopefully someone else has already said something similar to this
if you feel like you’re guessing at grammar. Go ahead and hit the ‘beginner’ on the home page and see which of those you feel like you don’t know. Go to the page and remove them from your reviews. Now, the other ones in there that you feel like you do know- go to resources and study. With Wanikani I feel like yes it can be more of a memorization game, but grammar is not. You need to understand the rule to apply it. I personally only do 1 grammar point a day- on the weekends if I feel like it- I might do two. I have a 9 to 5. So I do 1 grammar point and I watch at least one youtube video on the grammar point and try to read the entry in Amazon.com: A Dictionary of Basic Japanese Grammar: 9784789004541: Makino, Seiichi, Tsutsui, Michio: Books because I’m a spoiled adult with adult money. I actually have one of those books at home, one at work, and one in the car. So if I’m on chores with the car I can read it. I can study it at home. Or I can cite it when arguing with a friend over grammar points. I have become the grammar nerd of the group now.
You’re probably also doing too many words a day. I do 8/d on bunpro if I’m using a deck here. Only on Wanikani can I get crazy and do like 20/d (in which case I am doing 0 in bunpro) because it’s just a bunch of Kanji I already know with a little bit of Hiragana in certain patterns that tend to have a predicatble meaning.