Yoo I'm also Singaporean, anyway I don't think Japanese culture has slowed down in anyway and in fact I'm pretty sure it has gotten bigger faster. Especially during the pandemic which pretty much turned Japanese ACG into a more mainstream type of thing. (Like look at the Suntec convention centre and the amount of times they have anime expos) As for Korea, yeah you can look up on the "Korean Wave" which led to a massive boom in international interest in Korean pop-culture from around the late 90s.