I have a patent, and the technical threshold is not high. What if others don't cooperate after negotiating with the manufacturer and then bypass the patent to produce similar products?

I have a patent for a pen. If I want to discuss cooperation with a manufacturer, I should first apply for a patent at the Administration for Industry and Commerce and get the patent number approval of the patented product, and then publish the invitation letter of the partner online. If I have the intention of enterprise cooperation, I will sign an agreement with a third party to notarize the contract, and then I can do it, and everything will be executed according to the contract.