I just got an email about Nativshark going live. They only seem to be selling lifetime subscriptions at this point. While you can start now, a lot of material won’t be online until later on this year. They have a roadmap of a lot of the features they plan to add and when. It looks really interesting and can you can start as a complete newbie if you don’t know anything but looks like it will allow you to progress to more advanced grammar and other stuff.
I’m going to finish up Wanikani first, but I think I’ll also give Nativshark a try. I figure by the time I finish up Wanikani, they should have most of their content online and any bugs smoothed out.