Vote.
Who says not to hold them accountable? People are merely saying, when it comes down to it, vote knowing the actually possible outcomes for your preference. If someone is particularly bad, vote against them, if someone with a shot who is really good, vote for them.
Where was all the “we are just holding them accountable” during the primaries? Why wasn’t there a movement to challenge Biden in the primary, if it were so important to hold him accountable?
People are justifiably suspicious that in all the ways that could matter (down ballot, primaries, even day to day protests outside of election season) the “revolutionary left” is suspiciously quiet and suddenly they are yelling from the rooftops in the singular race that they can not “win”, only screw up.