You can check out the website BunPro for grammar.
The free application Torii can help you with going through the core 10K vocab words without doubling up on what WK teaches you (it has a WK mode that excludes all items from the 10K that WK covers). WK has a lot of useful vocab, but selects vocab as reinforcement for the kanji, not for JLPT purposes. Kana-only words, for example, will have to come from other sources.
When you’re more into N4 / N3 territory, which makes reading much more doable, you can look into the website floflo, which can help you a lot with reading.
N1 binnen 2 jaar is echt afzien, maar hopelijk lukt het je. 