Mind (one's) own set
Translation of "mind (one's) own set" into Russian
mind (one's) own set
заниматься (своими) делами
He should mind his own set and stop interfering with others.
Ему следует заниматься своими делами и перестать вмешиваться в дела других.
Definitions
To focus on one's own affairs, responsibilities, or preferences, rather than interfering with or concerning oneself about others. The phrase suggests maintaining personal boundaries and not meddling in what does not directly involve oneself.