You phrased the question as an exclusion between two non-exclusive options. Before kids, I filled it with socialising, reading, sports, movies and personal pro

You phrased the question as an exclusion between two non-exclusive options. Before kids, I filled it with socialising, reading, sports, movies and personal projects (computer, home, car, bike...): it all mostly happened "naturally", never resulting in loneliness or isolation. After kids... what void?