Are there any basic concepts that you learned and later become infinitely more aware of how they work because your japanese got more advanced? For example てはいけない is just いけない meaning you can’t go forward while doing something. AKA you can’t do something.
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じゃない (で+は) was taught so early on (by extension です too). I also like learning where common phrases come from when you first see them in kanji, like 御免、お早う、只今、有難う
I’m not really “upper-level” but I had some stuff like this already.
For instance, in the first book I read I was confused with all the uses of the (extremely) common verb かかる. Frankly my magic bullet here was the cure dolly video which explains it.
Another one was all these uses of ように and various similar よう related grammar. It’s insane. I had to start my own document on this one.
Another one is all the uses of という. Some authors like to という in like every sentence and it takes me some time to get used to it.