Just give it time. Chemo knocks your hair follicles about something awful. My hair grew back chalk white, graduated to grey. It now has more colour (brown) than I had before diagnosis. But that took a couple of years to get there. Re-shaving just means your growth is set back and doesn't guarantee colour will come back any better or faster. A good hairdresser is an ally at this time! Your hair can also change texture. Mine is less coarse than originally, and the crazy frizz that grew back has settled into a stylable slight curl. We're all anxious to get back to normal, but it does take longer than you hope for many. Best wishes.