Wait, but just switching once isn't really enough either... you gotta keep changing them every so often, or use a password manager that makes new ones for you. Otherwise it's the same problem all over again.
Yeah, that "same three passwords everywhere" thing hits too close to home. My old system was just different versions of my dog's name and my birthday. Like, "Buddy123!" for my bank and "Buddy456?" for my email. Real genius level security over here. It's a miracle I wasn't hacked years ago.