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To get a better contrast, use levels. Hold down Opt/Alt while you drag the left (dark) and right (light) sliders just below the histogram. Your image will turn white, and you will be able to see exactly when you arrive at the darkest/lightest pixels in your image as they will appear on the white. This way, you can enhance the overall contrast. Yet, you loose some intermediate hues as your histogram will be torn apart.

To get the best result: take a new photograph with better contrast. Better that than having to mess with a bad one.

Or if you use traditional slides that yo scan: get scanner software that has levels, curves etc. Like Silverfast.