I'm in my 50s and currently have dyed mid brown hair. My natural colour used to be slightly darker, but now my natural colour appears to be white 
At present the white regrowth is very noticeable after 2 weeks. I have the roots done every 3 weeks.
Next week I'm having a colour change with a view to making the regrowth less noticeable. I'm not ready to stop dying it and let nature take its course.
But what colour would be best? My hairdresser is good, but I'd like to go with some ideas?
I'm fairly pale skinned, but have dark brown eyebrows (natural - how does that work?) 
Guidance please, wise ones.