A simple Photoshop method is to reduce saturation locally with a mask.

1. Open the image.
2. Add a Hue/Saturation adjustment layer.
3. Lower the Saturation until the strong color looks closer to the rest of the image.
4. Use the adjustment layer’s mask to control where the change appears:
   • Paint black on the mask to hide the effect.
   • Paint white to reveal it.
   • Use a soft brush with lower opacity for gradual transitions.
5. If needed, add another adjustment layer for different areas that need different amounts of correction.

Another workable approach is to create a new layer, set its blend mode to Saturation, and paint with a neutral color (such as black, white, or gray) using varying brush opacity to make overly colorful areas look paler. Then adjust the layer opacity to fine-tune the overall effect.

For most cases, the Hue/Saturation adjustment layer + mask method is the easiest and most flexible because it is non-destructive and easy to refine.