They got old
It's really just that guys
Idol groups are short lived and their charting is mostly based on hype and freshness status. When you are young, you are cool. Once you start aging you get uncool and unfresh
Twice exploded 5 years ago in Korea, it's an eternity for idols. Twice still being able to reach top 20 with current charting rules proves how big they actually are, they amassed a big enough group of followers and listeners to keep eager for their music despite the said ""GP"" not bothering as much as they used to
I'm sure in older charting rules they would have another top 5 song just fine
I agree but this is the experimental era of TWICE!!!