Goldwater was followed by Nixon and Ford, Goldwater didn’t change the party.
The founding fathers were conservatives, not libertarians.
The European left had not even started libertarianism yet.
Libertarians would have been lynched in 1790, calling for abortion and gay marriage and pornography and hookers and so on.
You are describing liberal thought, not libertarian. I an libertarian in that I believe in laissez-faire capitalism and strong private property rights. Unlike many libertarians I am a strong nationalist. I an also against abortion, gay marriage, uncontrolled prostitution and pornography.
Having said that, I also know the "War on Drugs" is a total failure! Beyond that, after all efforts for over 40 years against drug use, our children are drugged at the recommendation of our school systems which is barbarous. My libertarian beliefs are vehemently against the evil of Socialism. The Department of Education has no basis in The US Constitution.
Whether you like it or not, our founders were not Conservatives. If they had been we would still be deferring to Her Majesty and speaking the Queens English.
Jefferson wrote that a number of authors exerted a general influence on the words of the Declaration. The English political theorist John Locke, whom Jefferson called one of "the three greatest men that have ever lived", is usually cited as one of the primary influences. John Locke was the foremost classical liberal philosopher. Libertarianism is the modern form of classical liberalism. Thomas Jefferson adopted many of the ideals of classical liberalism but, in the Declaration of Independence, changed Locke's "life, liberty, and property" to the more socially liberal "life, liberty, and the pursuit of happiness".
"A second stream of thought growing in significance was the classical liberalism of John Locke, including his theory of the "social contract". This had a great influence on the revolution as it implied the inborn right of the people to overthrow their leaders should those leaders betray the agreements implicit in the sovereign-follower relationship." — Wikipedia®
Goldwater did change the party because we are here. Goldwater ergo sum.