dying hair without damage?

my hair is highlighted and was already kind of dry, but I just moved up north and the air is super dry and it’s been drying out my skin and hair even more. i want to dye my hair a dark brown/black, but I don’t want to damage it as it’s already super dry.

What are some dyes that I can do myself that won’t kill my hair? 🖤🖤

+edit: I’m allergic to coconut, so anything with coconut oil I can’t use 😩😭