What are the best supplementary resources for WaniKani? What about after WaniKani?

I also like LingoDeer quite a lot. I’ve heard it doesn’t go that far but it’s effective to teach the content it has however incomplete it may be.

Here are the exact numbers per subject types, extracted using the API :
Radical : 478
Kanji : 2027
Vocabulary : 6301

I think that 2047 is more than you need. The list of joyo kanji includes 2136 kanji but many of them are useless.

I think that from a certain point, you know enough to be able to learn by practice. Just use your Japanese and learn when you encounter new things.

Here is a page linking to everything you could dream of related to learning Japanese : The Ultimate Additional Japanese Resources List! .