Your biggest enemy in this is going to be other self-described leftists who think that it doesn’t matter, that politics cannot change anything and expect immediate reward in the form of some kind of “armed revolution” and anything less than that is too boring and slow for their attention spans.
I'm a secret third thing: a self-described leftist (is there another kind? do I apply somewhere?) who thinks electoral politics will never save us, and armed revolution doesn't have the critical mass to save us any time soon.
I think America is the only thing that can kill America, and that that outcome is inevitable, and the duty of any person of conscience is to organize and bond their community together so the fewest possible number of people die during that collapse. This means different things for everyone, but it should include growing food if you're fortunate enough to be in a position to do so, then freely giving it away to neighbors.
That's not doomerism. I think the world that comes after will be better, but the turbulence leading there will be horrific.
With that said, I do admire your revolutionary optimism and I'd prefer you be correct than me. Feel free to block me anyway though, I don't really mind that either.