You can only recover what still exists in the scan or, better, in the negative. If the lab scan has already clipped the bright areas to pure white, that highlight detail is gone from that scan and can’t be recreated in editing.

With film, the negative often holds more dynamic range than a typical one-pass lab scan. So your best option is to rescan the negative, ideally at multiple exposure settings, then combine those scans in SilverFast HDR or similar software to pull detail from both highlights and shadows.

That may improve the bright forehead and the darker face, but expect limits: very dark areas will usually show more grain/noise when lifted. In short, editing the existing scan may help a little, but if important detail is missing, a better rescan is the real solution.