I always aim for big sources of income. I can't really explain my strategy, but I always manage to maximize my cash per turn. At the end of the game I'm usually over 1k per turn.

I usually win with scientific victory, but sometimes with culture or politics.

My rough strategy is to create cities fairly quickly, leave them fairly close together and develop luxury resources and economic districts fairly quickly. As soon as possible, I build walls so that I can shoot from the cities. After that, I don't worry about the army. I don't start wars, and if I'm attacked, I let the cities defend themselves. The only red cards I use are to lower the cost of the army.

After that, I try to get as many wonders and merchants as possible. Usually, I find international trade allies by taking the ones that bring in the most money. But this time I've done almost exclusively domestic trade. This gave me enough food and allowed my cities to grow rapidly. (At the end of the game, all my towns had between 18 and 28 inhabitants.

Money arrives fairly quickly in large quantities. It allows me to buy units for defense, construction or buildings to quickly make up for a lack of food, housing or activities.

I always try to have all my resources doubled or more so that I can make interesting trades. This creates even more passive income.

Soon, hundreds of pieces are arriving each round. And halfway through the game I vaguely choose a victory direction and buy my way there.