isolate (or divide or fragment a person or thing from others, esp. those with which it normally is or should be connected) v.t. atomize

There was enough interest, though, for Sky Germany’s coverage of the first round of [soccer] games in this bleak new [Coronavirus] world to draw in six million viewers, a record, each of them watching from home, atomized and all but alone, a tribe still bound by its colors but unable to gather under its standard. (Rory Smith, “This is What Watching Soccer Looks Like Now,” The New York Times 05/18/2020.)

When used in the sense above, this word can also be synonymous with fragment, divide, segregate, split (apart) and alone.