The thing is, Demi is capable of so many genres, and has tried a lot of them.
RnB - All Night Long, Who's That Boy, MLILAS
Bubblegum Pop - RDC, STWN
Pop - CFTS, Heart Attack
Ballads - Ok there's a MASSIVE list....
Pop/Rock - DF/HWGA eras
The GP just doesn't seem to latch onto them

But if she goes all Ariana with the promo, she will smash imo. She just needs to have that 1 giant platform, which I'm sure we're getting in this era. Confident (song) is accessible to the GP, radio friendly, easy on her vocals so live performances will be good quality, I think we're heading in the right direction.