The assumption is that Biden wins. I believe Biden will win the popular vote, but Trump's back-room deals etc may be a whole number of cons to cheat the people and Biden-Harris out of the Presidency for Trump.
Biden must not fold as Gore most famously did early in this century.
Liberals will go back to sleep. Progressives will fight as they are doing now - for the people - as in all of us. Only if Biden is pressed into a "Save the Human Race" campaign with regard to the climate crisis. Without a favorable climate humans will be extinct, and the Earth will be fine - but without humans. This is one reason I'm looking to AOC as the candidate to challenge Biden or Harris for the candidate of choice to run against Trump in 2024.