Go about your business - Idioms by The Free Dictionary
go about your business
go about (one's) business
To continue doing one's usual tasks. Oh, don't pay any attention to me, just go about your business. Go about your business, people. I'll let you know when we can start the meeting.
go about your ˈbusiness be busy with the things that you do every day: He looked out onto the street and watched the people going about their daily business.
References in classic literature
When the rest of your friends are transformed you can return to the upper world, and go about your business
Ay, go about your business
, I hate the sight of you.