you can measure this in a commercial sense or popularity or whatever u wanna base ur opinion on but which groups do u think have reached their peak in the industry and cant really see them emulating the same kind of impact again? Spoiler: My View Momoland- Bboom Bboom era.. i cant see their music gettin int+ national popularity like that again but im so glad they finally got attention this year. Red Velvet- red flavour era. theyre always releasing bops but i think this era had the most impact and should be their signature song winner & ikon - provided rightly crowned national hits with 'really really' and 'love scenario' . idek if theyll be able to top these respective eras especially in terms of national attention got7 - i think 'Just Right' introduced most of us to them and i forever will love this song. i dont think theyve had a song since then that made them grab everyones attention. 'hard carry' was a good contender i guess. cant think of any other groups atm, ill add on more if i think of some. Thats my opinion anyways - i do hope im proven wrong though!