In terms of modern writers I’m not sure if something like Pickettys Capital in the 21st Century would count, I haven’t read it and not sure if he’s a Marxist. Michael Hudson has good modern analysis as well.

He’s not. A critique: https://www.yanisvaroufakis.eu/egalitarianisms-latest-foe-a-critical-review-of-thomas-pikettys-capital-in-the-twenty-first-century/ (And varoufakis’ is not what most people would consider a Marxist, and I don’t think that ‘egalitarianisms’ is marxist goal anyway)