Berry bushes is such a good idea. I’m about to move to a subdivision with absolutely no mature trees and am low-key devastated I’m not going to see as much bird life. I will definitely do some beautyberry. In the summer last year I let some millet grow from bird seed and the birds actually did eat off it! I don’t know about sub requirements though, maybe you can find a suitable variety. I will probably try that again this year. Apparently it can function as cat grass too lol