The dems failed to convince enough people to vote for them. The largest share of votes in the last election was for no-one. Your primary job as a political party is to convince people to vote for you. if they can't get people motivated in the face of bare faced fascism then they need to take a serious look at why their policies do not speak to americans.
Very few people who voted for Kamala were voting FOR Kamala... they were voting AGAINST Trump