Most Helpful Girl
Hair dye can be a black hole. Highlights, lowlights, darken it, lighten it, damage it, more low lights, more highlights, more damaged, cut it, bored with it, dye it some more, and it just ends up a frizzy mess.
If you want your hair to look good, it can't be super unhealthy. The more you change the color and the more drastic you go, the more damaged it gets. So I would suggest just stop dying it and growing it out. Maybe have a professional put in a few highlights if you really must. But try to keep it minimal.