I think one thing that happened recently is that we saw a desire for change. The number and enthusiasm of Sanders and Trump followers points to that. Maybe there is a place for a party to represent the views and values of those who followed Sanders.
Just thinking about it, there was a previously unknown, old, white, male politician who had such a tremendous following from so many people. What happened to that crowd? Those people are still out there, young, many in college, new graduates, minorities. It probably includes factory workers from Rust Belt and so on. There were so many followers despite media ignoring them in-large, despite the main DNC establishment disliking them and they still got so many votes.
I think doing the same thing over and over with the DNC as before, is probably not going to work. How feasible is to take all those invested billions and create a new movement instead of fighting fake news, why not generate good news. Instead of forgetting about the workers whose jobs are being automated away, perhaps talk about basic income in the way that would be accepted and not be seen as a humiliating hand-out.
What better to improve Democracy by creating a more parties to represent and replace the crusty old one with all their baggage and corruption.