do own thing
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do one's (own) thing
To do what one is interested in or skilled at. 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
do (one's) own thingSlang
To do what one does best or finds most enjoyable: "I get paid to try cases and to do my thing on trial" (Bruce Cutler).