Libertarianism is dead as a political philosophy. Accept that you can still be for the non-aggression principle, wanting to leave others alone and be left alone, but there's no politics in it.

There's too much leverage and interconnected-ness. Everything boils down to whom the guys in the nuclear submarines and direct energy weapons take orders from.

The reason Libertarianism is so ineffective in politics is similar to the inefficacy of gun control. Wanting to opt out of the state is exactly like hating guns, as in it doesn't change the fact that guns exist.

As a Libertarian you're left with only one choice:

Choose which side of that gun you're on, or let your enemy choose for you. The state can only be controlled by state power, so you best cozy up to an era of fascism if the state is to be reformed.