right now they're extra sensitive to issues that upset their constituents
Quite the opposite. Right now is the maximum time before the next election. That means they've got the longest time possible for you to forget. Any shenanigans they'd like to engage in would be safest now.
It is the maximum time, but issues are not that simple. The long-term members of Congress know the electorate are upset, and want to make nice; the new members are spoiling for a fight; the Dems are in disarray and retreat (I haven't a clue as to why), and the GOP is eagerly taking ground. It's a perfect time to push an issue with your Congress members.
Of course they can! Mail, email, they can certainly be reached, and right now they're extra sensitive to issues that upset their constituents.