Don’t underestimate the power of these three chords, 1, 5, and 4, to paint an evocative landscape. But similarly, don’t underestimate the power of borrowing a note. In this case, a Bb from the flat side.
This Gm belongs to the key of F. Source your flat side chords from the key a fifth below. Chords like Bb, Eb, and Ab can be useful visitors to the key of C.
And you can share that with someone who belongs in a Beat Kitchen glass.