what songs really define the essence of kpop?

I've seen a lot of people talking about kpop losing its relevance, and that since 2023 there are less and less people interested in the genre. I've also seen opinions from various people attributing this to a lot of things: that kpop has become "Americanized", that the songs don't convey anything, that the choreographies are no longer focused on being amazing but easy to learn for TikTok, lack of originality, lack of talent.

So my question comes because I want to know the sound that people miss in today's kpop, the sound that would make many people feel interested again in new and fresh groups. Songs that really define the essence of kpop.