I HATE my hair!

A month ago I went from a box dyed brunette to a blonde belayage. I spent well over $200-$300 but I don't like it anymore and I want to go back to brunette! I feel like I've wasted so much money going blonde just to hate it, I don't know what to do! 😞 I also got a hair cut the other day, I asked for a straight cut with thinning out. He gave me a straight cut, but he also gave me REALLY short layers so the top of my hair looks really thick! Do you lovely ladies have any tips on growing hair or the hair dye situation? 😞