Finish & Launch AI Marketplace App

I already have a working Figma-to-Make prototype for my circular-fashion marketplace ( -> Make with AI) . I developed an app in Figma -> Make with AI. The majority of functions works, but I need to add the following:
• Ensure authenticator works properly
• Ensure that if you are not logged-in, you cannot send messages or sell products
• Add AI features in the sell page so that if the buyer post, the AI feature can enhance the picture to make it better
• Provide with an easy interface that I can modify to track all the searching done in the ap, I need a customer databse

The output should be an APP and a website integrated.