Year help: I have been dying my hair for 10+ years! - Help.com

I’m not expert, but bleaching, then dyeing should work.

Overall, I’d only really be worried about dyes hurting my scalp or roots — hair grows back.

if u go to the nearest beauty place, they will strip the color out of ur hair than they will put you natural color back then u are free 2 do what ever color u want

Depends how dry your hair is, if its fairly dry then the colur would fade fast but for it not to take at all is odd. Was it a permenant colour or was it a semi?
Also what colour are the highlights you have, are they bleached ones or highlift?
Maybe try picking the highlighted bits out and colouring them 10 mins b4 the rest of it so they have colour on for longer, if all else fails then go to nearest hairdressers and ask their advice. I am a hairdresser but without seeing your hair and what condition its in i can’t realy give the answer

Well that answers my question!! lol