Amerie. She's known for just six hits (1 Thing, Why Don't We Fall in Love, Talkin' To Me, Gotta Work, Take Control, Paradise). The quality of her albums >>>>>>>>>>>>>>>>>>>>>>>>>>>>
Out of my main faves, Fiona Apple I guess. Björk's current US sales are lower than Fiona's, but Björk is more global, has sold millions more overall, and is lowkey a legend. So yeah, Fiona.
Out of all the artists I actively support, hmm... I don't think any of Blake Mills' albums have charted on BB200?