For some insane reason in the US left and liberal have become synonyms. Now, I am both, but I want the separation to be there so I can be both and distance myself from the illiberal left.
What I find really scary is that since left-wing has become to mean the same as liberal, a large part of the US population has come to define themselves as anti-liberal when I really hope that is not true.
The first line of wikipedia for liberalism is: "Liberalism is a political and moral philosophy based on the rights of the individual, liberty, consent of the governed and equality before the law. Liberals espouse a wide array of views depending on their understanding of these principles, but they generally support individual rights (including civil rights and human rights), liberal democracy, secularism, rule of law, economic and political freedom, freedom of speech, freedom of the press, freedom of religion, private property and a market economy."
I sincerely hope that is something we can come together and agree are important in the US. Even though it sounds like you and me have very different political views it also sounds like we agree that all of these are good. That means we have a wide array of items we agree on, but that are in danger at the moment. It seems to me there is a common platform most of us could agree to, but both parties have been to some degree hijacked by extremist so both of us to some extent are supporting illiberal candidates when we really don't agree with that.
Which is also not much of a home, since it generally is inhabited by non-serious people- but at this point at least I can morally live with a platform of you stay out of my way and I'll stay out of yours. The other options have too many compromises right now.
Replacing FPTP with RCV would elect more centrists, but without proportional representation there'd still be two parties I think.
I think the problem is not that the parties are too strong, but that are too weak to strong interest groups.
But liberalism is primarily about freedom, about equality under the law, but not necessarily economic equality. Low taxes, little social security, wealthy industrialists owning everything is still compatible with equality under the law. So there are economically right-wing and left-wing interpretations of liberalism.
Similarly, people who are for or against economic equality can have liberal or authoritarian views on how to accomplish that.