here is an example
1. just go into image - Adjustment - level
In my opinion it’s best to do this to get the grains and pulp to stand out. So you want to play to have all those little spots to come up. If you go any further then your texture will turn into 3 color values
2. image - adjustment - hue/saturation
now, if you go too far with the saturation it might make the colors too harsh. If that’s the case just turn down the lightness.