From what I’ve seen, diplomats in Canada can’t just switch over directly to permanent status. Usually, they need to apply like everyone else — either for a work permit, study permit, or PR through one of the immigration programs. The tricky part is that their diplomatic visa doesn’t automatically give them those options. I’ve heard it’s a good idea to talk to an immigration lawyer, because the process can change depending on your country and the type of visa you hold. It can be a bit complicated, but definitely possible.