stick to knitting

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stick to your knitting

if a person or company sticks to their knitting, they continue to do what they have always done instead of trying to do something they know very little about He believes the key to a company's success is to stick to its knitting rather than trying to diversify.
See also: knitting, stick

stick to (one's) knitting

To mind one's own business.
See also: knitting, stick