meldor
Deity
Automated workers are brainless. They will have your cities producing way more food and a lot less shields than they could. The first step is to learn to manage those workers yourself.I automate all my workers and have the governers control the people's mood.
Governers are idiots, fire them all, better yet have them face the firing squad. The second step is to learn to direct where yoru citizens work almost all the time. All of the best player micromanage production. Learn to shift from food to shields and back again as needed to get the most out of your cities. Last you must road and railroad every square that you use to make most of it.
Some other things that may help you, do trades as pure gold and not gpt. They are cheaper as cash and not gpt. Only use gpt when it is coming to you or the civ in question is likely to reneg on the deal. At the lower difficulty levels you should be able to stay way ahead of the AI in tech and if you milk the game to 2050, you should have completed all of the techs and be on the "advanced tech" for bonus points.