the hype she built in 2019 with "Gotta Go" and "Snapping "was completely killed by pre-release singles "Stay Tonight", "Play" and "Dream of You" that were seen as underwhelming by the gp and didn't get that much promotion. the final nail in the coffin was her full album which took waaaaay too long to be released (Querencia was released 10 months after the first pre-release "Stay Tonight") and the songs themselves weren't outstanding enough to make up for the long wait.
but by no means do i think Chungha can never go back to where she was, just like how her debut "Why Don't You Know" underperformed but the "Roller Coaster" did phenomenal,,, i think all MNH has to do is to give her a string of 2~3 comebacks on the same level as "Roller Coaster", "Gotta Go", or even "Snapping", and she'll be fine