What does 50 mirrors mean by grinding the bright moon twice?

This is what the fortune teller said, but I can try to understand it.

The old mirror has been polished again. In the past, mirrors were made of copper, which needed grinding for a long time to see more clearly. What is said here is to innovate and re-plan.

Full Moon: The full moon symbolizes the questions you want to ask, such as your occupation. The full moon shows that your career is in full swing, but when it is complete, it will be a loss. If things go too well, they often end badly. You should be careful to spend the current peak period.