Make colour a bigger part of your image…
Select the Sponge tool (beneath Dodge and Burn). Once it’s selected, you can hit O to quickly jump to it. Press Cmd/Ctrl+J to duplicate the background.
In the Options bar, set the Sponge to 200px with Hardness: 0%, Mode: Saturate and Flow: 60%. Also tick the Vibrance box to prevent over-saturation.
Paint over the subject and any areas lacking colour to bring saturation back to normal. Apply the brush in strokes to control the changes. Lower the Flow to apply more subtle colour to areas, if needed.
Watch out for colour banding; this occurs when the Sponge is applied too heavily. Apply the changes to a duplicate layer, so you can lower Opacity to fade the effect and try blend modes like Saturation.