I'm mixed with black and Italian how can I get my curly healthy?

I'm mixed with black and Italian and I curly hair. I do the deep condition co- wash and wash my hair every week and a half. But my hair seems like it's soooo weak I detangle my hair and before I know it I got a hand full of stands in the comb and on the towel and on my fingers and I have had it. I colored my hair once in like 5 years and I wish I never done that. I going natural as long as I can and maybe on my birthday press it out just for that week. But I don't feel like my hair is strong enough to do anything. I twist my hair and I can hear the stands snap. I just started using olive oil in my conditioner with heat and it seem like nothing is progressing. My reigmen is deep condition twice a week wash once every week and a half I use hawiian silk 14 in 1 as a leave in condition Shea moisture courl smoothie and Carlos daughter tui hair oil. But my hair still feels weak and not healthy. My hair is growing but I feel like it's shedding just as mush it's going. Help please!!!!