Hey, son. You have to be realistic. Isn’t it about time you followed in my footsteps and became a Buddhist priest?
A monk who is at master status is probably a priest by now... though not just any priest, this refers to a Buddhist priest.
The 坊 reads like you'd expect. Unfortunately 主 is an exception and read ず. Just think of a zoo that holds Buddhist priests in captivity. How sad, these Buddhist priests.