https://youtu.be/7fvCb5_Nzq4

TL;DW: keep listening to Japanese media for a couple of hours a day. Watch anime in Japanese with no subs, listen to Japanese podcasts or audiobooks in Japanese while you're working or doing something else, etc. Try to find something you know a bit about because it will help keep you engaged and help with context.

There's a chapter about tolerating ambiguity which means they in the beginning you won't understand anything and it will be very frustrating but you need to accept it and keep feeding your brain Japanese inputs. You'll learn the sentence structure and vocabulary as well as learning pronunciation, this is basically how babies learn. You're brain is really good at pattern recognition so just give it enough inputs and eventually it will start to click

Start doing Anki cards which will supplement all the inputs. Don't go overboard, just learn the alphabets and then some common vocab and keep listening to other media. After about a year, start reading and writing a lot. Read manga, read books, and start writing notes and stuff in Japanese.

That's basically it. You can use study materials if you want but feeding your brain more inputs is key. In addition to being really effective it has the benefit of being way more fun than studying grammar and whatnot

I don’t know shit about Cantonese and the only mandarin I know is the most basic of phrases and stuff to refer to food (so essentially nothing) so I can’t speak to that

Japanese is hard, but so is any language. You get out what you put in. I wasted about a year with “studying” half assed for like 10-15 minutes a day with duolingo. It was good that I had a consistent routine but at the end of 1 year I had very little to show for my effort. Learn from my mistake.

After that I switched things up. I didn’t put in a ton more time but I changed approach. Pretty standard but boring stuff: Anki, Assimil, and some other more targeted apps later on (renshuu, Benkyō, and most recently kanji dojo have been helpful). Setting up language exchange calls via apps like hello talk and discord have been far more helpful as things have progressed. This is more of a significant time investment and requires me to teach English a bit but I am happy to do it for free Japanese instruction. Joining group chats on line, watching YouTubers and vtubers, anime and dramas, etc also is helpful but the hard part was determining when to make the jump to not use subtitles and finding content that was digestible at my level. I’m not the kind of weeb that watches precure and little kid shows but for a minute I did just to watch stuff without subs. It sucked.

After about 5 years I got decent enough to have solid conversations via phone and text. Then DeepL came out and made it all pointless haha