I have no idea why which cities are best to relocate for should be off topic IT, as there are specific answers to that
and yet a question about how to CONVINCE people to join a union is NOT off topic?
The former is a common problem that people have addressed with a clear path to take. It's NOT opinion based at all.
The second should so clearly be off topic as it is about convincing others to do something, that it should have been shut down long ago.