I think you’re mis-characterizing what I’m saying. That isn’t the only two options, the far left could be a little more honest about how one gets to a majority and start working with the only party with power that somewhat aligns. It’s what I’ve done much of my adult life, I’ve swam in party politics, there is a lot more room for socialists, democratic socialists, progressives, etc in the party than people seem to realize. You just have to be willing to compromise for incremental progress instead of letting perfect be the enemy of good. Policy shifts move slowly, but they do move.

The left has a clear path forward to move the Overton window back, but it needs the far left to be willing to do something other than constantly masturbate our/their moral self righteousness. But parties don’t really shift the Overton window that much alone, society does, activism does, education does. Parties don’t give a great speech and everyone changes their mind. That kind of of leadership is a simplistic fantasy we sell ourselves, but really parties and leaders meet the moment, they don’t make the moment. Citizens need to get involved, the far left needs to stop standing on the outside looking in. They need to be committed long term to joining, and then shifting, the party for real.