Tips for hair growth.

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Back in 2015 I had long, black, healthy hair. I straightedge it almost everyday, dyed it almost every month and I still had pretty healthy hair. Untill around January 2016, I got bored and used Splat hair dye on my hair, which completely fried it and I had no choice but to cut it off to my sholders. And ever since then, my hair won't grow! I believe it will grow an inch every 4 months, but I get it trimmed every now and then because it's apparently supposed to be healthier. But, it just brings me back to my shoulder length hair. I've tried everything to get it to grow out. Deep conditioning treatments, hot oil treatments, not washing it everyday, cutting down the dye for 6+ months. No heat whatsoever. I literally just throw it up in a bun and go on with my day. Does anyone have any tips? Something that doesn't cost alot of money? Affordable, free tips?

My hair in 2015.

My hair now.