Hair emergency!! Oh man, I effed up realllll bad. My roots were coming in. Natural hair used to be…

Hair emergency!!

Oh man, I effed up realllll bad. My roots were coming in. Natural hair used to be very very dark brown. But in the last few years it has started to light up quite a bit. Close to a light/medium brown. My hair is dyed darker because I feel like it is more flattering on my very yellow undertone skin that gets pale in the winter. I thought "hey you know what, it's almost summer. I could get away with having a lighter brown hair" omg... My roots are very light brown (boarding brassy blonde) the rest of my hair is still dark brown. I gave myself hot roots so effing bad. I had the dye on my hair for 30 minutes and only 7 on the roots. Helpppppp, what can I do to lighten the already dyed hair?? Worst case scenario I can just go dark again, but now my heart is set on being light brown ???