This document lists various niches that the author has worked with including Christian, comedy, credit repair, crypto, dance, dating, drums, fashion, finance/entrepreneurship, fitness, food, golf, gymnast, hair stylist, magician, model, motorcycle, music, music producer, Only Fans, pet/animals, sports, rating strangers, and real estate. It emphasizes that Instagram Reels presents a major opportunity for individuals and businesses to expand their influence and increase sales on Instagram, and advises the reader not to miss this opportunity.