should i dye my hair

okay so i have natural black hair. it used to be blonde a year ago from bleach and then i recently dyed it back to black using professional dye. now i wanna go super dark blue like blue black (ill insert pictures). do i have to bleach my hair again or should i just put dye over the black. also recommendations on dye pls!! (first 2 pics is of my hair now, and the last two are what i want to achieve)