not (one's) place (to do something)
To not have the authority in one's role or status to do or say something. I know you're just trying to help, Mom, but it's not your place to discipline my kids. I know you're worried about your brother's marriage, but it's not your place to tell him how to live his life.
not one's place
not one's role to do something. It was not my place to criticize my boss. It was not Bill's place to ask the questions; it's my project.