Give it the context it needs. If you have internal APIs give them a .proto file or whatever you use to define an API. Phrase the question in a way that forces it to explain its thought process. Use chain of thought reasoning. Find documentation online, give it the documentation, then give it your code, then ask it to do something. Frequently spawn new sessions, if ChatGPT is repeatedly giving bad answers start a new session, modify the context, and ask in a different way. Basically you have to brute force it to get it to give you the answers you want on harder problems.