Honestly as I see it, you just have to work with a party (because it has an established base and lets you skip the annoying part of having to start totally from scratch) and build up political conscious until a breaking point happens. Keep organizing in your community, or encouraging unions and strikes, and trying to improve the world around you. You may get lucky and be able to take advantage of some random events and then suddenly that “decades happen in weeks” thing occurs. Its really just about being powerful enough to take advantage of political fervor.

Although new things exist, tech has changed many aspects of life, the core relations exist. In fact the modern times are more similar to the times of Lenin than not. Many socialist authors have adapted the works of old to match the more extreme class gaps that exist now. They are not the useless dusty tomes that liberals will make you think they are. There is a reason Marx is the most cited economist in human history.

The bars may have changed, new wings added, new tortures thought up, but the prison is the same.

this is from my experience and what I have read, it may not be reality, learn more by reading and helping people in the world.