go about one's business

verb2

1. •
   To attend to one's duties; to do what one would normally be doing if not detained, distracted, etc.

   • Crowds gather on the platform at Birmingham New Street to take photos of D1015, on the 'Pathfinder Finale', as CrossCountry Turbostar 170105 goes about its business alongside. — 2026
2. •
   To depart; to resume one's usual activities, after being detained, distracted, etc.