i want to go from highlights to single process blonde, help?

i am a level 6 naturally. i have heavy light blonde full head foil highlights and almost my whole head is blonde. the roots come up in 3-4 weeks and i want a more solid blonde look. so i want to switch to full process color because it's SO much cheaper than highlights and this way i can do it every 4 weeks since it's 1/3 of the price of highlights.

my stylist said my level 6 can probably become a warm golden blonde with a single process. i am pale with light eyes (hear that level 6 people with light eyes/skin are less likely to turn orange because of their natural pigments)

do you think this is true? anyone have any advice/thoughts/experiences with the matter? much appreciated