I think this is an excellent idea, especially the “simultaneously” part. If you are not a superhuman with infinite resources of time (and brain), this will probably slow you down wrt WaniKani, especially in the higher levels when you get lots of reviews from the lower levels on top of your daily load. But that’s okay because I believe that you will get a lot more out of your Japanese studies when focusing on all parts of the language at the same time (at least grammar, vocab and kanji).
For immersion, it’s a frequent complaint that the materials geared towards early learners are quite boring. Therefore I second what others here said and what you also said: Learn from what interests you, and you will get a lot more out of it, even if it’s more difficult. If you are looking for inspirations on what to read, here are some suggestions:
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We have a 📚📚 Read every day challenge - Winter 2022 ☃❄ where people frequently share what they are reading, and there are lots of beginners among the ranks who read cute manga or ghost stories or whatnot. Technically, the Winter challenge ends next week, but you are still welcome to hop in straight away. We will start the next challenge on April 1st, I guess (we run this for 2 months and then take a 1 month break so that everybody can catch some breath in between).
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We also have book clubs! Depending on how far you are into your studies, you might be interested in the Absolute Beginners Book Club // Now reading: Horimiya // Reading Next: Miss Shikimori is not just cute! or in the Beginner Japanese Book Club // Now Reading: 舞妓さんちのまかないさん.
Those clubs already read lots of books and produced a wealth of discussion threads and vocab lists, ready for you to consume. You can find the list of past book clubs in the clubs’ main pages. -
If you don’t know how to acquire books and other reading material, there is the Resources for Starting to Read Japanese Content
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There are also some threads out there regarding listening, and some people are currently forming an Anime club, if I’m not mistaken. But I’m not involved with this so I’ll leave it at that.
Happy studying!