Since your hair is naturally a dark ash blonde and you are currently a light yellow blonde, you have 2 options.
Option 1- bleach and tone your roots
Apply a bleach like clairol born blonde and 20 volume developer, leave it on your hair until your hair is yellow with minimum gold tones, then apply a toner like clairol creme toner with 20 volume in shade 315 d light golden blonde leave it on for 15 to 25 minutes.
Option 2- since you are naturally light you should be able to achieve a light blonde with a highlift hair color like clairol complements in shade 12a highlift ash blonde, or wella color charm 210 frosty ash mixed with bp (blonding plus) and 40 volume. You would leave both of these products on your hair for 30 to 45 minutes.
I would personally chose to use the highlift blonde's over bleach. Because it is much better for your hair! You may end up still needing to double process your hair and apply a toner after the highlifts, but since your hair has yellow in it I would say you need to apply a toner anyways.
p.s. if you would like your hair allover less yellow and lighter you could apply the wella blonding plus with 20 volume all over for 25-30 minutes and you would be very very light blonde. If you do this mix the blonding plus 1 part of developer to 1 part product, not 2 parts developer to 1 part blonding plus as the directions will tell you to.
You can get all of the mentioned products at sally beauty supply. good luck! 
------------- fyi I know my spelling sux!
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