Can I do this?

A few months ago, I bleached my hair blonde. It turned out pretty nice, but I want my natural color back. :( This is what the blonde looks like:



And this is my natural color (excuse the oiliness; I just added a coconut oil treatment to my hair):



As you can see, my roots are pretty intense and are starting to drive me crazy! Is there any way to dye the bleached hair back to my natural color, or should I just keep waiting for it to grow?

P.S.: My hair is very healthy. I wash it every other day with shampoo and conditioner specifically for dry hair, in addition to using leave-in conditioner every night and   treating it with coconut oil once a week. I only straighten it once every few weeks or so.