I've learned a lot about history, especially the 2nd world war. Found out I have a particular interest in warships (and no, I never watched/played Kantai Collection/Azur Lane/other ship things).
I've continued learning new kanji, although I've been a bit lazy regarding that for the past few weeks.
I made an effort to consume content in german, such as streams, youtube videos, music and Pokemon. And gee, who would've guessed, my rusty german has been improving and I'd say is even somewhat better than it was when I graduated from high school.
I thought about learning how to read korean just for the heck of it, but never went through with it.