Convince a court, somewhere, anywhere, that you are right. If that doesn't work, become a conspiracy theorist and convince yourself that everyone else is colluding to hide the truth.
No, the courts have all been taught the same delusion. The thing to do is keep repeating he is illegitimate. Keep up the whisper campaign. Keep saying it day after day. Keep informing the public he is a liar and a fraud, and that he is not even an American at all, let alone a "natural citizen." (All of which appears to be true.)
Keep ratcheting up the economic pressure. Starve his supporters in any way possible. Point out the economic collapse which he is currently overseeing. Talk about the corruption of him and his supporters.
Keep talking about putting him and his supporters in prison for their activities. Usurping the executive authority of our nation ought to carry a death penalty in my opinion, and I think the world would be a better place if a few thousand collaborating liberals ended up in front of firing squads.
When things break, he and his supporters need to be seen as responsible for causing our problems so that some serious pain can be brought down on top of them.
Remember the 11th commandment. "Thou shalt not get away with it."