Anyone here a hair stylist?

Casey

I currently have a balayage (brown to blonde) and it is very blonde at the bottom of my hair. I want to dye all of my hair back to dark brown but not sure how to go about it. I’m afraid if I put the dye all over my hair, the blonde will turn into a lighter brown than the top of my head near my roots that is already brown. How do I go about this?