What appears to be working for mine, they aren't completely grown in but thicker than they have been in years:
1. Moisture
2. If I must brush, using a baby hair brush, no hard bristles or vigorous brushing.
3. I relax the nape only twice a years
4. I do not apply heat to these areas (only blow dryer, no curling/straightening implements)
5. Protecting these areas when I'm sleeping so they do not rub.
6. When wearing a instant weave, I wear a headband and tuck the bottom combs under the band, it never pulls on my hair.
7. NO tight pony tails or buns.
Products:
1. Castor Oil
2. MTG
3. Surge
4. Infusium 23
Good luck!