I've dyed my hair nearly every color too, Alhamdulilah I still have thick hair. Like stoppit said it's what u're born with. Eating well may help u overall, oiling may improve the quality of what u have but there isn't anything that will make u're hair grow faster..or make u're hair grow. No such miracles.
Maroush copper is IN..it'll look really nice with u're natural moussy hair-color. Going 3 shades lighter than u're own hair-color looks nice too.