Lucky for you, I'm not a Marxist. There is a very large current of people who are socialists but not Marxists, and have spent literally over a century analyzing history, economics, and capitalism itself, without insisting on the coercive hierarchy of Marxism or capitalism. And it has a long history of working in practice, even if in the modern day it tends to be crushed by both Marxist and capitalist forces, because who knew an authoritarian structure could allow you to command huge armies and oppress others?

You seem well aware of authoritarian communism, but generally unaware of libertarian socialism. They are distinct, and the latter has a decades long history of despising the former as much as you do, though for being based on the same primary issue as capitalism: coercive hierarchy.

It all starts with assuming the freedom of human beings, and that the only way to organize a system has nothing to do with efficiency or profit, and everything to do with maintaining that human freedom. It must be based on human freedom, and the concept that no one knows how to run your life better than you do. That no one deserves to be able to force you to do things. Whole systems arise from that fact, that have a long basis in history. As I've said elsewhere, you don't end up with men on the moon or dollar stores, but you do get people who are in control of their own lives.