The problem is, Marxism was created over 100 years ago. I bet Karl Marx wouldn’t agree to his own theorem for the world we live actually. It needs upgrades, and an other name and shouldn’t be set in comparison with the systems which tried to be marxism / communism.
On what grounds do you think he wouldn’t agree? Marxists since Marx have expanded on his ideas, like analysis of Imperialism, but Marxism is stronger than ever and consistently proved correct.
Smaller steps would be a good start, why not take a closer look at Portugal? A left government recreate the whole state in just a few years and save the country from being bankrupt. This wasn’t Marxism, but it was a left wing party with really good ideas.