Need help from a hair colorist!

So I've been trying to go lavender. I've bleached it 3 times from dark brown. I'm a yellow-ish blonde right now (I used olaplex). I got Pravana lucious lavender, Violet, and silver. I used the lavender and a little bit of Violet but it just dyed my roots the color I want and the ends just ended up a slightly less yellow blonde. What should I do to get it all lavender?