How can I make my hair long and luscious again?

I'm a 12 year old girl with shoulder-length blonde hair. I continuously dye my hair. Maybe 2-4 times a month. I change my colors a lot. And I also straighten it 2 times a day. I know this all is REALLY bad for your hair, especially at a young age. I want long hair very badly, and I also really want soft, silky hair again. My friend who shall remain nameless straightens her hair once a day but doesn't color it, and has extremely soft hair. I just want to know how I can make mine more like hers. Soft, long, and to die for. Any tips? It's appreciated!