I saw that someone said that their hair is in a resting phase and thus wasn't growing: at any given time, your entire head of hair won't be in a resting phase (telogen phase), 20% absolutely max could be. Your hair may have certain "growing seasons" - many people report that their hair grows faster during certain seasons, like summer. Don't get discouraged, 6 months is still a formidable amount of time to make some notable progress in the health and length of your hair
(at least this is what I tell myself lol )