Where do I start aside from WaniKani?

Anything that you find enjoyable would be a good start. Anime, movies, podcasts, youtube videos. There’s tons of media out there that you can start doing some immersion learning with.

Grammar is another thing you’ll need to work on. Either using an app like BunPro or a textbook of your choice.

You can take a look at the resources list for some inspiration! ^^