Best way to add more black to this hoodie?

Recently bought this hoodie second hand and I like it but I would love it more if it had more black dye in it. I want the added dye to not look out of place with the black already in the sweater but I’m not sure the best way to go about it. Any help is very appreciated!

Recently bought this hoodie second hand and I like it but I would love it more if it had more black dye in it. I want the added dye to not look out of place with the black already in the sweater but I’m not sure the best way to go about it. Any help is very appreciated!