I would rather solve these questions than add another decorative layer.
Can a new listener follow the melody on the first listen?
Are the lyrics understandable without reading them separately?
Does the chorus feel like a destination rather than another verse?
Is the lead vocal louder and clearer than whatever supports it?
Are pitch mistakes changing how the melody is perceived?
Is the tempo stable enough that rhythm sounds intentional?
Does the arrangement support the lyric rather than compete with it?
Could another singer imagine a different interpretation?
Are obvious recording noises or edits distracting from the song?
Does the demo still work when you stop explaining it?