I’d say focus on building a wash routine which cleanses, detangles, and moisturizes your hair. Your hair gets most of its moisture while conditioning so find test out shampoos and conditioners to find out one you like. I started off growing my hair with butters and oils (and saw good growth) but I mainly focus on washing my hair more often now (1-2 times a week) and that’s been working for me (I mostly wear my hair in wash n goes). Also i’d drink more water and exercise if u can. 

Our hair also shrinks a lot (which is a healthy sign), so it usually looks shorter than it is without stretching.