Thats a huge jump in colour & not really one to do urself at home. U can buy another colour to put over top (preferably a nice brown?) Do a strand test first if u d.i.y and it may also help to make sure u start from the top as ur hair has lightened more there...OR GO TO A SALON

(NEXT time u attempt a home colour it helps to wrap ur head with glad wrap as the heat is distributed evenly, it colours evenly) If u really want to go blonde ur hairdresser will need to bleach ur hair and then put a colour on top. Think about the up keep, re-doing ur roots etc, and dont 4get those dark eyebrows!