If what you are doing isn't working, do something else
If you tried a key in the lock and it didn't open the door, then what would you do? Would you keep using the same key in that lock over and over again hoping that eventually it would open the door?
You'll probably thinking, no I would try another key or I'd try another door. But it's amazing that in life, many people, in certain context will, metaphorically, keep trying the same key in the same lock and expect a different result. It's like banging your head against a brickwall and hoping it will move out your way!
Have you heard the expression - 'If you always do what you've always done then you'll always get what you've always got'. It's true.