The late, great Permaculturist Toby Hemenway left his rural acreage to move back to the city. Then he wrote a book called "Permaculture City" to show the many benefits that living in the city provides to those with a self-sufficiency mindset. I read that book a couple years ago so that I could find out that it's not crazy, in fact it's very doable to "homestead" at the urban scale. A city lot is all I've got, probably for a long time.
After reading, I realized that the first thing I had to do was to mentally stop fighting the situation. I'm still kind of working on that acceptance, actually, but it's much better now than it was at first. After a couple years now of growing a few things in the front yard, and getting more in touch with the rhythm of the flow of the seasons and the patterns that exist in my ecosystem, I felt a shift flow through my mindset. Today I feel comfortingly aware of and connected to that giant rhythm around me that I am a part of, even if I don't have my "three acres and cow." It's all bigger than I am, and I am a part of it wherever I live, and it will go on and on. That just feels good to me.
Related to this, I also have challenged myself to some interesting experiments in order to say, "Bleep you!" to my feelings of limitation in a city scenario. I raised 12 chicks in my bathtub last year just to feel like I could be a farmer. That was hard, and also it was really good for my outlook on life. I don't think I would have tried this experiment if I didn't want to challenge my limited mindset in order to expand it.
I have many more thoughts, but right now I have to run and help my mother with her chicken coop roof on her acreage!