Big "L" libertarianism doesn't have a monopoly over self reliance, personal responsibility, personal liberty, and privacy. These are pretty much universal tropes easily available and repeatable by any political stripe. Just saying them doesn't really count.
The problem with Libertarians is that they have no understanding or critique of power relations beyond State power, no analysis of how concentrations of economic wealth relates to the political sphere, an inabilty to wrestle with the social repercussions of raw market outcomes or market failures or externalities, and a dogged unwillingness to address the fallout from unregulated capitalism past, present, or future. Far from complex or considered, their views seem lazy, narrow, and backward.
As long as Libertarians are unable to address BIG issues or introduce a kind of social organization to meet them (that isn't "government"), they can remain the Star Trek convention of crackpots theay are on the American political scene.