It's of little use for you to apply for a patent for appearance. It's been two years since you applied for a patent for utility model. Don't think about the shanzhai, you can only sign a confidentiality agreement with your processing factory to ensure that the processing factory doesn't leak. A batch of products are sold to make money and then sold at a low profit. Let competitors feel unprofitable. This is how intel competes with AMD. Of course, you can also apply for a patent while producing. This is called a protective patent, to prevent others from preempting the patent and then suing you, so that you can't sell it.
also, when you start to produce this product, you should pay attention to preserving the evidence (such as the official invoice and contract for opening the mold). Prove that your product was produced earlier than others, so that you can prove that others are squatting on your patent.