Hello, according to the provisions of China's patent law, applying for a patent requires three characteristics, namely novelty, creativity and practicality. Your self-developed product has been put into the market, which means that this technology has been made public and does not have one of the three characteristics of novelty, so you should apply for a patent before making it public to ensure novelty. (Zhuo Yi Intellectual Property)
I hope I can help you adopt it.