Natural blonde.. dark brown SEMI Permanent dye. How do I get it to fade quicker?

Well the only way a hair colour fades is through washing your hair a lot and extended heat for which you don't want, how long has the dye been on for? How long is it meant to last? Because if you can't wait for it to go and its been on longer than it should have MAYBE you could think about stripping that last colour you had on, hair has colour pigments and some peoples hair is more porus than others yours has just stayed and grabbed more and with you being blonde before hand too. It will fade eventually but will just take that bit longer.