Self coloring help

I’m tight on $ right now but want to dye my hair myself so I was thinking of going to sally beauty and dying my hair back to the closest color of my natural hair. Some professional help would be greatly appreciated. My hair is a medium/dark brown and kinda has a grey tint to it. I got it done professionally back in June and had it dyed a pearl blonde. I just need help with transitioning back to my natural color as much as possible. Usually when I get ash dye it’ll turn my hair more grey or a green tint so I stay away from anything with ash in it. Thank you for any help.