If you want to change up your turnaround at the end of a phrase in natural minor, try this chord progression: i - N6 - i6/4 - V - i.
The Neopolitan Sixth chord voicing is a flat II chord in first inversion, meaning the third is in the bass (bII6; e.g. from low to high strings in Am: DBbDF). The third of an N6 chord is the fourth of the i chord (D).
The cadential i6/4 chord is the 'i' chord with the fifth in the bass (2nd inversion). (e.g. from low to high strings in Am: EACE)
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