Keep it black, if your natural color is a softer black, return to that, but add some auburn and maybe a couple of teeny tiny aubergine highlights, most of which are noticeable only in the sunshine.
And yes, I am describing my own Dream Hair, which I have to wait to have because when it started growing in white I used permanent color to keep that fact secret, and the chemicals that would be necessary to remove that, AND the lightening process, would be a lethal combination that would ruin my hair, according to my Hair Artist, so let my sad tale be a lesson to all my sisters who share the World's Most Popular Hair Color, or as I like to call it, "regular," and when you start to see a little white stripe on either side of your part, use DEMI-Permanent, so you will have Options without having to wait years, because once it is ALL white, the world's your oyster, except that if it is naturally "regular," you are probably never going to look really good with anything much lighter than really strong coffee with no cream, even if your skin is light. This is because of undertones, and a lot of other complicated factors that have to do with the fact that God does a pretty good job as a color stylist, and his originals are better tweaked than radically altered.