stay in one's lane

verb4

1. •
   (informal) To mind one's own business.
2. •
   (informal) In a way whereby one avoids dilettantism: avoiding giving an opinion in domains where one's skills and knowledge are not at an expert level.
3. •
   (informal) In a way whereby one avoids interfering in others' interests, regardless of skill level.
4. •
   (informal) To keep to one's own kind; to avoid intermixing or associating with other types of people.

   • That's because this place is racist, but also because most black filmmakers don't have an interest in integrating. They've accepted the premise that they must stay in their lane […] — 1999