Do you have a 613 blonde human hair wig? Have you ever tried to dye the blonde wig to another color? Yes, the blonde wig is the most manageable, when you are tired of the blonde color, you can just color it as you like.
No need to bleach the hair, you can dye it directly. What color do you want to get?
But we do recommend that it dyed by a professional hairstylist, to avoid the wig being ruined:)