I think you're getting a little ahead of actual results. DSA succdem candidates have started winning a bit but that's really far from the entire US going succdem.
But still I think it's worth thinking about. Maybe nothing? I want fully automated luxury gay space communism. But succdems are a whole hell of a lot better than ice agent fascist death squads.
That will leave the actual fight to the next generation but there's not a whole lot I can do about that. Treats to the working class will neuter any revolutionary spirit.