They should have given people on the left some reason to be motivated to vote though, not just fear.

This is the massive key that I really don’t think the Democratic party understands. When people are scared, they vote conservative. There are literal studies that show fear is the driving force behind conservative voters. Democrats need to make them feel safe. That’s one of the reasons Obama was so successful - he ran on change and hope. Fear works for Republicans. It doesn’t work for Democrats. But they see fear working for Republicans, so they copy it.