Your hair is dry and absorbing moisture from the air making it frizzy, use moisturizing products and blow dry on cool to manage frizziness. If you want to go from black to brown by yourself: Color oops will help you get out the black dye if you want a drug store solution. If you want your hair even lighter you may need a round of bleach in that case use 10 vol, 2:1 ratio with bleach powder, don't leave on too long, watch tutorials use protein treatment after do not overuse. I do not recommend getting your hair done professional I do it myself and it's much healthier than when I got it done by a professionally, but if your bad at doing your own hair it might be the better option. Use a high lift color if hair needs additional toning, sally's hair dye is fine, could try to get professional dye if you know someone. Your hair will likely be reddish when you remove the dye so you'd want an ashier shade of brown, like 6A. Colors are labeled by number (level of how light or dark dye is) and letter (how warm or cool hair is), plus look at color wheel and ask an employee for help.