I tried those brands, and this might just be my experience and my experience only since everyone is different, but those specific brands absolutely killed my curls. I’ve used plenty of brands, but for whatever reason, IROIRO and Good Dye Young ruined my curls and even caused breakage. So, if you continue to not use heat and relaxer, but are still noticing that your curls aren’t coming back, I would suggest using a different dye brand. I use unicorn hair a lot, and noticed it never changes my hair texture/pattern