This argument is clearly not your own. It comes from Jordan Peterson. Unfortunately he is being intellectually dishonest when he attacks Marxism by "strawmanning" it into something it is not.

Marxism is actually two different things. One is an intellectual form of analysis which looks at economics as the driving force in class relations. The other is a political movement. Peterson is being dishonest when he lumps the intellectual movement with the political. The political movement failed brilliantly because there is no way for the 'proletariat' to rise up and govern themselves. But the intellectual form of analysis that looks at economic and social forces behind capitalism and class relations is a valid form of analysis.

I am not arguing for Marxism, but that your argument is not sound because you are just repeating talking points of Peterson. And Peterson has an agenda.

As you said, "think for yourself". Don't follow the talking points of Jordan Peterson. Although he has a lot of valid points, he has clearly jumped the shark in the last few years.