An advantage I have enjoyed is that I am insanely careful about my fundamental architecture and I have a project scaffold that works correctly.

It has examples of all the parts of a web app written, over many years, to be my own ideal structure. When the LLM era arrived, I added a ton of comments explaining what, why and how.

It turns out to serves as a sort of seed crystal for decent code. Though, if I do not remind it to mimic that architecture, it sometimes doesn't and that's very weird.

Still, that's a tip I suggest. Give it examples of good code that are commented to explain why its good.