going from black to brown hair! help!

Mace

my hair color is originally darkish brown with a bit of blonde highlights, i have it dyed black, but i want to go back natural, i know i’ll have to bleach it, but would any of you know about how many sessions i’ll need and the typical price it is for bleaching?

here’s my hair now

this is my natural color

not sure what group to post this in😬