It is on enough voters to have them stay home, it only vote down ballot, vote third party, write Sanders in, Vote for Trump.
If Voting for Biden does nothing to make their lives better, and for many people whether it's Trump or Biden makes no difference to their lives, they why would they.
You need to stop only thinking through your own lens and start thinking through theirs.
They lost their homes, jobs, friends and family, and even some lives due to no medical coverage, fake wars, and being foreclosed on while the bankers were fine. They lost jobs that never came back due to trade deals. They lost loved ones to war, disease and opiods.
And Joe Biden was a key part of the policies that caused this. Remember that.