Schakiaw
growth aids don't help to retain length, your regimen does. a sulfur mix may give you a boost but with lack of proper care it could break off. vitamins/minerals fill in any missing gaps provided you are eating healthy.... they are never a replacement.
a recipe for a sulfur mix is 1 teaspoon sulfur to 8oz oils/butters and apply to scalp 3-4 times a week. i use natural oasis hair grease (no petrochemicals just oils, herbs and a tiny bit of beeswax) cause its easier for me to apply than pure oil. after applying i baggy for at least 30-40 minutes so it can better penetrate.