Following a bit on what RobbyV said in his first suggestion: Bunpro really needs some handholding when pacing and pathing are concerned, especially for new users. While I appreciate a lot the pragmatic and succinct approach of Bunpro, most people in the early stages of learning a language need the didacticism of a textbook or an equivalent. Maybe one day Bunpro will have its own courseware, but until then I really think that Bunpro should explicitly instigate the usage of the material these paths originate from and do that as early as possible. Even if making users go away from the site for a moment might sound a bit counterproductive, I’m very confident of Bunpro’s retention as a product when used alongside a textbook. I’ll try to explain my reasoning below through what I have experienced.
I stumbled upon this site on the wanikani forums, and while I really loved its design and SRS approach, I didn’t go beyond my free month, even with the subscription being criminally cheap. The reason was simple: I couldn’t either pace nor situate myself. I was given grammar points with very succinct explanations (which are double-edged) and had to review them. These were fun for a while, but once I saw that retaining and getting better was very slow, I dropped out. As a side note, a few friends of mine went through similar problems.
A few months later (or a few weeks ago) I decided to started trying to read some stuff in japanese and, with only Wanikani by my side, I was in urgent need for grammar lessons. I picked up Tae Kim’s book and loved it, but I reaaally starved for exercises. That’s when Bunpro exploded from my memory like a volcano and now I can easily say that it’s a great tool to assist in grammar learning.
TL;DR: Bunpro is very hard if you’re starting with zero or close to zero japanese grammar knowledge thus the usage of textbooks or equivalents alongside the tool should be explicitly instigated as early as possible.