Of course you can just start doing this, but there are a lot of real, difficult problems in the world that'd be solved if people "just start solving them."
It's good to feed into people's agency but it's bad to rely upon it.
People in the past weren't more socially connected because they had more ironclad determination to be more socially connected.
The reality is that there are lot of external factors that mediate the formation and maintenance of communities like the one you have built: physical proximity, the built environment and what activities it supports, availability of less "fruitful"/social pastimes, etc.
People are struggling with this now because these external factors have changed dramatically over the last few decades. A few exceptions here and there (and there are plenty!) does not actually stand up against a well-documented epidemic of loneliness. There is simply no evidence for the implicit claim that this trend is due to people being born with less determination to be socially connected.
There is plenty of evidence that we have built our cities (and especially suburbs) to be socially atomizing, our culture has shifted toward extreme individualism (which, unsurprisingly, atomizes), our media is now hyper-personalized which atomizes our perception of the entire world, we have significantly degraded important social institutions (nothing has filled the vacuum of religion), we increasingly prevent our children from going outside and building their own social networks, we change jobs with increasing frequency, we physically move locations with increasing frequency, so on and so forth.