Danielle I have to say it's my humble opinion that you should stay blonde. And that's surprising because I normally go for brunettes! But here's why. With your shimmering blonde hair you look extra angelic, which is a really appealing contrast to how naughty you can be
With darker hair you lose some of that innocence. BUT the most important thing by far is that you're happy with it so I say do whatever you think you'll be happiest with. Maybe you could go brunette for a little trial period and see how you feel?