The solution is Democrats holding their politicians accountable and quit rewarding bad behavior with reelection. It's not up to leftists to offer an alternative, if liberals did their job an alternative wouldn't be necessary. Instead they focus on targeting the people trying to hold YOUR politicians accountable since liberals won't do it themselves.
It's not up to leftists to provide an alternative candidate for democrats. Unless they have a D next to their name democrats don't care. They would rather have their team win than actual progress for the working class