Small-scale sci fi

Does anyone here do smaller scale sci fi, ie focusing on a single settlement or city or planet rather than a whole galaxy? Basically, sci fix without a focus on space travel. I feel like worldbuilding sci fi that has space travel is a bit easier to start with, since you’re painting in broad strokes and you can make up a lot of stuff. But harder to flesh out in detail.

Meanwhile in smaller scale it feels harder to start because you’re down to the smaller details from the beginning… I want to write a sci fi story that takes place maybe 100-150 yrs in the future and focuses on my home city, but I’m having trouble where to begin. Like what makes this period different from present-day?

Right now it feels like the 21st century but with my skyscrapers lol