Hair care advice needed! PROFESSIONALS pleeeeaaaasssseee help! I'm a natural brunette with full highlights....?

Dying hair damages it. Especially if you have been doing it over years. This will take you a long time for your hair to be like it was. Cut it short and don't dye it anymore. Maybe once or twice but not more. Tone it if you like but if you dye it too often, it'll be like right now.