There is rarely one right answer. Here are several categories of pairing options, each with a reason it may work.
Avocado
Similar lightness for a subtle, tone-on-tone pairing with minimal contrast.
Burnished Gold
Similar lightness for a subtle, tone-on-tone pairing with minimal contrast.
Dark Olive Green
Similar lightness for a subtle, tone-on-tone pairing with minimal contrast.
Dark Goldenrod
Similar lightness for a subtle, tone-on-tone pairing with minimal contrast.
Moss Green
Enough lightness contrast to read as two distinct colours without feeling harsh.
Brass
Enough lightness contrast to read as two distinct colours without feeling harsh.
Caramel
Enough lightness contrast to read as two distinct colours without feeling harsh.
Peridot
Enough lightness contrast to read as two distinct colours without feeling harsh.
White
Strong lightness contrast and saturation for a bold, graphic pairing.
Mint Cream
Strong lightness contrast and saturation for a bold, graphic pairing.
Off-White
Strong lightness contrast and saturation for a bold, graphic pairing.
Ivory
Strong lightness contrast and saturation for a bold, graphic pairing.
Grey
A low-chroma neutral lets the original colour stay the visual focus.
Taupe Grey
A low-chroma neutral lets the original colour stay the visual focus.
Ash Grey
A low-chroma neutral lets the original colour stay the visual focus.
Silver
A low-chroma neutral lets the original colour stay the visual focus.
Blue
A saturated accent from a different hue family for a deliberate pop of contrast.
Ultramarine
A saturated accent from a different hue family for a deliberate pop of contrast.
Magenta
A saturated accent from a different hue family for a deliberate pop of contrast.
Navy Blue
A saturated accent from a different hue family for a deliberate pop of contrast.