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 like placing the fourth of i in the bass of a major flat second chord (IIb) (e.g. from low to high strings in A minor: D Bb D F).
The cadential i 6/4 chord is the i chord with the fifth in the bass (e.g. from low to high in A minor: E A C E).
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