People with fairly long (shoulder or more) healthy hair what is your secret?

I dye regularly because I have some grey hair and because I like different colors because I get bored.. my hair was ok but I bleached it last year to make it pink.. seems like it burned down my hair and even though I kept getting haircuts i keep it short it is still not growing well :( I take my vitamins and I use keratin and masks and coconut oil and everything.. I feel like shaving all of it just to make it all grow again :(