I personally am pretty new to learning Japanese, but this is what I’ve been told so far:
WaniKani is a great tool for learning kanji, but it definitely doesn’t teach the most useful vocabulary. The vocabulary is mainly there to make the kanji stick better due to reinforcing them again.
So, you shouldn’t use only WaniKani for your Japanese studies, but also some other sources like Anki for vocab (you can make your own vocab decks there or download one that has already been made) (also, you can use Anki for other things too, but as far as I know, it is mainly being used for vocab), Bunpro for vocab and grammar and Satori reader for grammar, vocab and reading practice.
You also might want to have a look at this list here.
Good luck with your studies 