Hillary did not do debates, probably because she learnt when she debated Obama that she was no good at it. She also didn't visit the red States which were vital to her winning. They have better electoral representation than the blue states.
She shot herself in the food. Bernie Sanders should have been the candidate. Poll after poll indicated that if Sanders was elected as the DNC choice, he would win against Trump twice as much as Hillary would.
I found it interesting at the time that none of those polls were published in the liberal media. Some progressives purposely voted for Trump because they were so peeved at the way the DNC rigged everything.
As long as the DNC rigs the kind of people who can run for president (the kind that support the neoliberal economic system and big money), so long liberals stand no chance of winning.