I spend a good amount of energy trying to explain the merits of Marxism-Leninism and Leftism in general on Lemmy (and IRL, though that's much trickier). Ultimately, you can't make someone care. You can't convince people of something they choose not to want to believe, either, no matter how much evidence you throw at them. Roderic Day wrote a great article titled Masses, Elites, and Rebels: The Theory of "Brainwashing" that perfectly encapsulates this process. People license themselves to believe whatever it is that they believe benefits themselves, regardless of evidence or empathy.

What you can do, however, is explain the merits of that which you believe in, and this is far more effective with people already targeted by the current system. Those closest to the edge, those radicalized by their conditions but not yet organized or versed in theory, are the perfect people to talk to. The effort required to gain an ally in that sense is far less than someone who is convinced that the system is fine, but just needs a little tweaking. Building strength through organization helps legitimize your positions and expands the circle, so to speak, by moving the "line of radicalization" further. Person A, who believes the system is fine but needs tweaks, goes from comfortably mainstream into the new line of radicalization, one step away from working to supplant the system, when those who were radicalized near them organize.

Further still, as conditions deteriorate, more people are impacted and more people are radicalized. This is both good and bad, bad in the sense that more are affected by the evils in society to a greater degree, but with the good being further chance of organization.

Just my 2 cents as someone who has spoken with many different people about Marxism.