There is rarely one right answer. Here are several categories of pairing options, each with a reason it may work.
Sea Green
Similar lightness for a subtle, tone-on-tone pairing with minimal contrast.
Jade
Similar lightness for a subtle, tone-on-tone pairing with minimal contrast.
Forest Green
Similar lightness for a subtle, tone-on-tone pairing with minimal contrast.
Verdigris
Similar lightness for a subtle, tone-on-tone pairing with minimal contrast.
Teal
Enough lightness contrast to read as two distinct colours without feeling harsh.
Sage Green
Enough lightness contrast to read as two distinct colours without feeling harsh.
Green
Enough lightness contrast to read as two distinct colours without feeling harsh.
Pewter
Enough lightness contrast to read as two distinct colours without feeling harsh.
Ash Grey
A low-chroma neutral lets the original colour stay the visual focus.
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.
Taupe Grey
A low-chroma neutral lets the original colour stay the visual focus.
Ruby
A saturated accent from a different hue family for a deliberate pop of contrast.
Tyrian Purple
A saturated accent from a different hue family for a deliberate pop of contrast.
Cerise
A saturated accent from a different hue family for a deliberate pop of contrast.
Crimson
A saturated accent from a different hue family for a deliberate pop of contrast.