I picked the middle ground where I have a small food garden in the summer and buy from local farmers in the winter. The stuff I can’t get from locals I get from grocery stores. It’s not all or nothing, but it’s a great idea to tip the scales so that you have SOME independence and learn a skill or two in the process. I think your garden will be a great starting point if you expand it so that most of your needs are met there during growing season.

On top of that, one area of skills that is often overlooked is how you can develop self-sustainability is to learn to fix things. Buy stuff that is fixable, then when it breaks learn how to repair it. One easy example could be a knit that got a hole in it, a more difficult project might be fixing a pair of leather shoes or a busted computer.