I think
Twice: plateaued sales and weaker digitals as compared to before.
Seventeen: Their sales seem constant. I'll be keeping an eye on their next comeback to come to a full conclusion.
ITZY: A typical JYP gg debut with high peak and then lukewarm reception in their following releases in the lane of Miss A.
Monsta X: Past their peak imo. The sales have decreased a lot.
I do not talk about their western reception because none of the groups I mentioned above have considerable international presence that can be considered impactful on a wider scale.