ok, so you can be innovative
my approach to this would be, also constructing a freehand EQ filter (often looks like a sharp moon landscape, but result sounds clearer and smoother), that compensates for some flaws in the mic preamps, and A/D. some of this is totally visible in the spectrum.
IMHO mic and pre should not be your first issue in this project.
I think, it is the (current) reverb and the doubling (+how much autotune or not). but the singer was only so good at that day...
you could turn around and go for the live, natural, fresh sound of a young girl.
ah.. I seem to hear also some hard limiting in the upper mids, that can take away quite some power.
I like the song and the overall sound, except the very low end might have a little issue. (HF can't be discussed with a 128kbit compression, but seems not too bad, otherwise the mp3 would sound spitty)