You could always try just a t section / parting of very fine highlights op as a bit of a test, with dark blonde to light brown hair they'll grow out looking very natural if you decide they're not for you. You could then get some lowlights of your natural colour run through the parting to break up any roots as they grow out.
I have just below the shoulder length very fine hair, light to medium ash brown in colour and my hairdresser uses a high lift tint rather than bleach. I really damaged my hair when I was younger with bleach highlights and trying to go really blonde.
I only get a t section now rather than half a head like I used to, my hair is so fine and it looks more natural plus it's less upkeep and money. I get them done every 3-4 months