Think the Opposite

Resign. It’s the best way to show people you mean business.
If people constantly reject your ideas or what you have to offer, resign.
You can’t keep fighting and losing, that makes you the problem.
If you are good and right for the job, your resignation will not be accepted.
You’ll be re-signed, on your terms.
If they accept your resignation, you were in the wrong job and it is better for you to move on.
It takes courage, but it is the right move.