So. I used to be of the, “If you’re that far along, just make an Anki deck for the rest. You should be able to figure things out for yourself at that point” camp.
But here’s the thing: Anki doesn’t work like Wanikani does.
Wanikani has a very unique type of SRS. And it goes beyond its intervals and Apprentice/Guru/Etc system. It has a gated system that prevents you from going too far without conquering what you’ve learned so far to an acceptable level.
I think that system works particularly well for learning kanji. And while you can more or less replicate it with other SRS tools, it’s far from perfect, and it requires a good amount of executive function to pull off.
I personally would love it if there was a Wanikani-style way to continue learning after 60. I’ve kind of put some thought into perhaps building something myself–like a website that copies Wanikani’s style for the remaining levels.
The problem with that for me (and for whoever else were to attempt making something like that) is that since it would have to be based on Wanikani’s foundation, I think monetizing it would be at best a legal grey area, and if it isn’t possible to monetize it then it is difficult to justify both the effort to make it and the continuing costs of servers and the like.