I'm doing a test of 60 days with scalp massages to see if it helps my hair grow.I too got a trim that took off 1-2 inches to even out my hair but I still have layers.I use to like having layers but now that I'm not going to straighten it for a while its kind of hard to manage.I can't do big braids to sleep in because it'll unravel.

I like your hair &I bet it'll look alsome when its longer

Skip shampooing or atleast dilute it
Deep condition weekly
Do a scalp massage atleast twice a week
Eat healthy
Drink 'healthy' like water milk juice tea
Keep your stress level down
Vitamins might help
Avoid wearing tight ponytails and buns
Avoid excessive direct heat use