The problem is the content isn't up to the standards, that's why people seeing less often.

Just take a look at some sites that provides such high quality content eg. Real Rapunzels. From there, you should ask the your long hair model to use these contents as inspiration to make a better ones.

Other than that, Indian long hair shampoo advertisements are really great. Feels like wanting to do a hairjob with a silky black wig while watching these...