I'm not natural now, but I grew my hair out to its current length (or very nearly there) while it was natural.
I didn't really pay much attention to it, and that probably helped. I would put my hair in braid extensions in two month cycles ( 2 months in braids, two months out of braids) - kind of generally following the Crown & Glory method.
While it was in braid extensions, I would spritz almost daily with a mixture of water, glycerine and Elasta QP leave in (for protein).
When it was out of the extensions, I would wear it in twists for weeks at a time, and often have them pinned up. I would also really moisturise my ends, even when they were in twists. And I would detangle very gently and carefully so as to not rip my hair out. (Bear in mind that I was combing only every 2 or 3 weeks, depending on how long I kept the twists in).
So basically: protective styling, low-manipulation, and moisture.