What helped my suburban neighborhood come together was putting in a community garden. We have apple trees, thornless blackberry plants, grape vines, strawberry and blueberry plants, and a raised garden bed for everyone. People talk when they come down to weed, water, plant, etc. It gets people out of their houses in the evenings and gives a gathering place where we also host the block parties.
My opinion is every suburban neighborhood should be planed with a central community garden place.
That's good for gardeners. Maybe also a communal board game space, a communal maker space, a communal basketball court, and so on? We can perhaps put them together into a "community centre".
It turned out that even people who don't want to garden would come out and just hang out and talk around the garden. Most humans just like being around green growing things. Probably from millions of years of evolution.
My opinion is every suburban neighborhood should be planed with a central community garden place.