do one’s thing

do one's (own) thing

To do what one is interested in or skilled at, rather than simply doing what everyone else does. You don't have to go to med school just because your sister did—you need to do your own thing. Andrea is very independent and usually just does her own thing.
See also: thing
Farlex Dictionary of Idioms.

do one’s thing

verb
See do one’s own thing
See also: thing
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • do one’s own thing
  • do one's (own) thing
  • do one's thing
  • do own thing
  • do your own thing
  • make good as
  • make good as (something)
  • Those who can, do. Those who can't, teach.
  • Those who can, do; those who can't, teach
  • strike out for (something or some place)