I fully concede that reading won’t work for everyone. Only some types of people, I suspect especially (but not exclusively) college educated types, which describes many liberals.

Anyone is susceptible who genuinely works at developing their political thought. Even if right now they are obsessed with Libertarianism or some other vulgar economics, someone who is already book-smart will be more likely to grasp Capital.

People not matching the above description might be better swayed with direct organizing. I think that the vast majority of Marxists across the globe, historically, have understood the basic conclusions of Marxism intuitively from their own experience and not from reading a book.

Anyway, perhaps your issue with the style of Capital is due to the translation you read?

Any book translated from the original language has to trade off between precision and flow. I personally like the style of the original Aveling and Moore translation that is free on marxists.org, but I think many people prefer the more modern English of the Penguin edition (Fowkes). I haven’t spent enough time to know if one is objectively “better.”