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Realistically, at least for those with less than an acre, your best bet in a SHTF scenario is to be able to provide value during such a time. I'm on 1/8 acre, with only maybe 500sq max of usable garden space (not an urbanite, but near the downtown area of a small ~2k population rural town). There is no way I can sustain myself completely in such a small space without demolishing my beautiful landscape. I can keep maybe a few months of rations in my limited space, so relying on this as more than a stopgap is hopeless.
Instead, I'd aim to provide value by being a consultant or a homesteading handyman of sorts. You can produce seeds and fertile eggs, and provide the help in raising them as well teaching others to preserve food. You can teach people to compost and capture it's heat for good use, or raise worms and black soldier fly larvae (high protein chicken feed, but you can eat it too). Clueless folks will need help installing rainwater collection systems, for example. And assuming electrical is back on eventually, at least for some communities or the upper class, you can presumably make bank helping them set up and maintain indoor high yield systems, like aeroponics, or install solar panels for those without. Even large scale farmers will need help getting off the grid, or adapting to supply chain catastrophes or utility disruption. You can gain these skills without much land at all, so I'm putting my efforts there.
And yeah, coffee's good for you.