You should read the John Brown Isekai... basically him dropped into a medieval slave economy, and learning from those mistakes, but still being very much not a modern leftist and true to his historical real self. The tactics are almost ours at first, and the early organising and primitive democracy is something we'd do in smaller groups and early days of revolutions, but it diverges all too soon. Still good though, a revolution story is a revolution story, and a bourgeois revolution is better than feudalism and literal chattel slavery.