have long hair again

When I was little, up until about Seventh grade I had long hair, and then short hair to my shoulders. Seventh grade I cut it super short to spike it. Then I kept letting it grow to about my shoulders or less, and then cut to spike it again. So, now I am trying to grow my hair out longer. It’s hard, I get it trimmed, but not sure what else to do. I used to do the hot oil treatment and I will think about doing that again.