Okk so i have natural blonde hair.. and i want it for summer again.?

alright so i have naturally blonde hair but since i was 14 ive been dyeing my hair from auburn to dark brown to black to all sorts of different shades of highlights then to a darrk brown and ive kept it there for a few years.. now, ive let it fade over the winter because i use all the natural amonia free stuff so it fades pretty quick and at the moment its at a light brown. i speed up the process a tad by using regular like .09 peroxide with my shampoo. i like the light brown but i'd love to have it back to its blonde. i have a darker bleach blonde naturally. so i dont think this will be detrimental to my hair in the long run. remember that im doing this gradually and want to be done by summer preferably. please no highlights ive been through that before its wrecked my hair. also i would prefer no bleach... i just would like to know how to get at a lighter bleach blonde natural for me. my eyebrows have always been a dark brown so thats not an issue. thankss