The voter turnout is going to be at record low levels for this election. Apart from the COVID 19 pandemic, there are opinion polls which claim that a large part of the American population is not supporting either of the two candidates. Some may go out and vote for third party candidates as a protest, but the vast majority will simply abstain from voting.
Even with the pandemic, they're expecting record setting voter turn out. Over 1 million people have already voted, at this point in 2016 that number was less than 10k.