Re: Will my original hair color ever return?
You'll have to wait for it to grow out....plain and simple.
Or, maybe you might have fun with colours while it's growing out...such as the foam in colours (semipermanent), I believe, from L'Oreal available at any store.
Bleaching removes colour, and if you want to have your colour eventually back to your own, you'll need to fill in what's missing which you can do over a period of time while having fun with colour.
What is your natural colour?
It's all a matter of perspective!