Well, first of all, I disagree about Clinton. She is horrible, but she operates within the constraints of her party and the bureaucratic machinery. Trump is every bit as bad, and he is not bound by anything but his own mercurial ego. His authoritarian instincts and encyclopedic ignorance aside, would you really have psychotic Trump, rather than robotic Hillary, as the commander-in-chief of the most lethal military force in the history of the world?
Now, what you conservatives should do I am reluctant to pontificate - not being a conservative- but, imagining myself in your shoes....
(1) Never Trump. Hillary and her ilk are the adversary, the usual target, a part of normal world you live in. Trump is different - he is an existential threat. Follow the call by George Will and make sure that Trump loses all 50 states. Never again anyone like Trump.
(2) Get a makeover. Conservatism is attractive when it is smart, well-mannered and, yes, elitist. William Buckley, not Sara Palin. Purge populism. Don't even bother to stick to the (correct) Hayekian idea that any expertise in complex systems like human society is limited and any long-term planning without constant feedback is inherently flawed. That's our, libertarian job.
Insist on extolling professionalism, knowledge and gentlemanly behavior.
(3) Become actually conservative. As political philosophies go, there are two forces at work in modern society, roughly speaking: the liberal (libertarian) force (less forcible governing, more self-organization and voluntary interactions) and the socialist ("progressive", "liberal" in the American jargon) - the opposite. American conservatism was neither here nor there, combining elements of both and forgetting its prime function: Being the guardian of tradition, the proponent of caution, pragmatism and common sense - a brake on both socialist and libertarian impulses. Such conservatism is a respectable, perhaps indispensable, part of any political discourse.