Greetings @lieath !
One thing I noticed that was not on your list, and which I have recently found to be very fruitful, is doing Vocab on BunPro (to access it, you just have to opt-in to the Beta features in your Settings).
The ‘official’ Bunpro Vocab Decks follow the JLPT level system, N5 (basic) to N1 (advanced), although actually they have a lot of additional ‘unofficial’ (so far at least) vocab items available if a particular word you want to study is not within the JLPT levels.
When you start to use a Vocab Deck, for example the Bunpro JLPT N5 deck, you should go into the settings and make sure to select a sensible ordering (the default ordering is something akin to ‘alphabetical’, which is not very useful IMHO), such as according to popularity in Anime, or Novels, or something like that.
That way, you start to see the most common words right away, and you’ll really see the benefit of it as it slowly (day by day, as you add more items to your reviews) fills in the gaps in your vocab. Words that you’ve seen many times but never took the time to look up, and so you’ve never quite got the nuance, suddenly become words you’re familiar with.
Also, importantly, in my humble opinion, is to go into the settings and make sure you’re using the Review Type called “Fill-in Question / Manual Answer” or perhaps “Fill-in Question / Reveal & Grade Answer”.
The “Fill-in Question” presents what’s called a ‘Cloze’ (basically a ‘fill in the blanks’) card, which has a complete Japanese sentence, with a blank ___ where the correct vocab would go. And this is why I highly recommend this feature of Bunpro. IMHO, it’s superior to any other format I’ve tried before (admittedly, I’ve only tried a few various formats before; perhaps there are equivalent or better systems out there).
The sentences are curated by the BP team, including being checked for naturalness by native speakers. Levels N5 and N4 include the audio of the sentence, spoken by a native speaker.
Level N3 has the sentences available as Cloze, but the native-speaker audio is not yet available. However, in the meantime, they have added a very natural-sounding text-to-speech voice which reads the sentences. Sometimes it doesn’t get things right, but you can quickly submit a bug report during reviews – it is still in Beta after all.
And, they are continuing to add full sentences for N2 and N1, and they recently mentioned that support for N2 Cloze input should be available in the next few months (perhaps as late as first quarter 2024). So, they are making steady progress, and if you start at N5 and work your way up to N4 and N3, then N2 will probably be fully ready by the time you get to it.
The biggest benefit, again IMHO, is that the sentences provide:
- Context for the vocabs. So, you learn much more the nuance and usage of the vocabs, rather than just a single primary meaning like a typical SRS flashcard.
- Lots and lots of actual reading practice! True, they are isolated sentences, so there’s not as much full-context comprehension practice that you’d get from reading a full article or story, but they are written in natural Japanese, and there are a lot of them!
- They also introduce exposure to additional vocab and grammar that are incidental or secondary to the main vocab you’re practicing. You don’t need to know the meanings of these words/grammar in order to fill in the blank with the vocab-under-review, but you get a kind of ‘peek’ or ‘preview’ of additional words, and become comfortable with seeing unfamiliar common words in a sentence.
- A gradual level progression. The BP team have cultivated the sentences so that they generally only use vocab from JLPT levels at most one (or maybe two? I’m not 100% sure) above the current level you’re studying. So, you won’t get dumped into the deep end of trying to understand a sentence with complicated grammar or rare vocab until you advance through the levels.
Probably other benefits, but that’s good enough for now.
Personally, starting to use BP’s vocab system has drastically improved my confidence and ability with reading.
One thing I would caution – personally, I’m prone to this issue, maybe other folks not as much – is to be careful to find an overall pace for yourself that you find comfortable, in the sense that you could imagine that “I could maintain this pace comfortably for the foreseeable future, even if significant roadblocks were to pop up in my life.”
If you’re feeling any significant amount of excess stress or feelings of ‘overwhelm’, then it’s probably a good idea to actually slow right down, reduce the number of daily new lessons you’re adding, perhaps even to the point of pausing all new lessons until you’ve got your daily reviews back to a comfortable pace.
The idea is to a) avoid burning out – burn out is awful and I wouldn’t wish it on anyone; but also b) find a pace where you are actually enjoying your Japanese studies. This enjoyment will be able to propel you forward indefinitely, and learning Japanese will not be any kind of ‘chore’, but more like a good habit and a fun hobby.
[Note: I’m assuming you’re not learning Japanese for work or class, or out of any other kind of necessity. Obviously, that kind of necessity will change how you have to approach things.]
If you’re prone to taking on too much stuff, as I am, then hopefully the above caution will be helpful to you. If it doesn’t apply to you, feel free to forget I mentioned it. 
