I don't live in a city, I live on four acres and have had vegetable gardens of varying sizes, including fairly large. If I put in the time to grow ALL my own food I would have no time to build the technology I'm building.
it's a paradigm shift nostr:npub19ma2w9dmk3kat0nt0k5dwuqzvmg3va9ezwup0zkakhpwv0vcwvcsg8axkl. It's not the food that's holding you back from self-sufficiency. it's the allure of luxuries in the city. It's trading real wealth for luxury.
literally everything on this planet comes from the earth. Food and shelter are among the easiest and most basic. The earth provides. God put Adam and Eve in the Garden. It's where we belong.
Protein is not as big an issue as you think it might be. Chicken, eggs, and fish are the easiest to start out with. But get yourself a rifle and steaks are back on the menu.
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Discussion
Then it's about priorities, not ability. You don't want to do it, not that you can't. There was a family of 4 living in LA for a number of years. They produced nearly 100% of their daily intake and income from their 1/4 property with a house on it...
It is very possible.
I also helped a buddy start a farm to market operation on 3 acres. More than enough for his family, and enough to sell for profit.
We did a number of 100' rows and chicken tractors. He had meat birds and eggs. No shortage of calories, nutrients or protein.
He never stopped working his full time job. Maybe what you need is a hand in getting started.