Long story short: tell your Congressfolk not to be cowardly about raising taxes on the rich, tell your Senators to pass the For the People Act, and tell your Congressfolk to pass the Baby Food Safety Act, the End Polluter Welfare Act, the Fourth Amendment is Not for Sale Act, and the Medicare for All Act. Use the tools in the upper right-hand corner of this page (or, if you're on a cellphone, the bottom of this page) to find your Congressfolk's phone numbers, or use the email/petition links (where applicable) in the following paragraphs.
First things first. Dan Pfeiffer, clearly one of the better political thinkers to emerge from the Obama Administration, argues that Democrats ought to "lean into" tax hikes on corporations, because, and I quote, "(t)he idea that Biden’s proposals to raise taxes on corporations and the wealthy are a political liability flies in the face of all of the polling as well as basic common sense." Hear, hear! Voters reward courage; they don't reward "this is the best we could do" or "Republicans wouldn't let us do more," and they sure as hell don't reward "I couldn't do the right thing because I'm in a swing district." You know what "swing" voters crave most from their reps? That they do the right thing! And they'll settle for the "courageous" thing, so you want to do an actual courageous thing before Republicans do the fake courageous thing. So go ahead and call your (Democratic) Reps and Senators and tell them they'll only get to keep their majorities if they do the right thing and raise corporate taxes. You can also tell them, if you're feeling ornery, that you wouldn't want to suspect that they're pretending not to understand this very basic calculus so that they don't offend their big donors. Votes win elections, not cash.
While you've got your Senators on the phone, tell them to pass H.R. 1/S. 1, the For the People Act. The Senate Rules Committee deadlocked on the bill on Tuesday, but Sen. Schumer used his power as Senate Majority Leader to advance the bill to the full Senate anyway, so now's the time to put the pressure on your Senators. They're no doubt hearing from the other side, though I'm not sure what arguments the other side could reasonably advance -- how can they say it's "a solution in search of a problem" when numerous state legislatures have repeatedly demonstrated the problem? How can they argue "record turnout in 2020" when states scurry to pass laws to ensure that turnout doesn't happen again? How can they say "bills like this should be passed in a bipartisan manner" when Republicans have acted in an entirely partisan manner for over a dozen years? Seriously, their arguments are dung. They need to hear that killing gerrymandering dead, disclosing big campaign donors, and ensuring same-day and automatic voter registration are actually pretty popular.
Food and Water Action helps you tell your Congressfolk to pass S. 1019, the Baby Food Safety Act. Because baby food sure as hell shouldn't have high levels of lead, arsenic, cadmium, and mercury in it! And the Baby Food Safety Act would actually set maximum levels for these toxins' presence in baby food, and establish mechanisms for lowering those levels as advancing scientific research would require. Why would we give babies food that might expose them to cancer and brain damage? The more pertinent question might be "why did big food manufacturing corporations do nothing about these things even when they knew about them?" Because a President Trump would let them get away with it no matter what we said, that's why. We have a better chance of influencing a President Biden in our direction, and that's why we need to tell our Congressfolk to pass this bill.
The Sierra Club helps you tell your Congressfolk to pass H.R. 2102/S. 1167, the End Polluter Welfare Act. The bill would, as its title suggests, cut some $15 billion annually in subsidies to big polluting corporations (like oil and gas drilling corporations) who hardly need the taxpayer help. And yet they'll fight to the death to keep them! Even as they admit to each other that tax breaks hardly matter in the decisions they make! (Hey, don't take my word for that -- take former Bush Mobb Treasury Secretary Paul O'Neill's word for it!) And, ah, why are we giving these handouts to polluters when we could be giving more of a hand up to solar and wind and geothermal? These things don't pollute anywhere near as much as fossil fuels do, and it ain't like the sun and the wind and the ground are going anywhere. Unless we destroy them all! How about we do the hard work of not doing that?
The Center for Rights and Dissent, Free Press, Restore the Fourth, and the Project on Government Oversight all help you tell your Congressfolk to pass H.R. 2738/S. 1265, the Fourth Amendment is Not for Sale Act. Big telecom corporations can't sell your personal data to law enforcement -- but they can sell them to private data broker corporations, which can sell your data to law enforcement! The Fourth Amendment is Not for Sale Act would close that loophole right quick, which would not only protect your right to privacy on the internet (I never agreed with folks who throw up their hands and say you just don't have any privacy on the internet; it's a species of cynicism), but would also save the taxpayer money! Yes, it would, since it's easier to just buy up a bunch of data ("WE NEEDZ IT TEH NOWZ, SO PAYZ UPZ!!!!!!") than it is to get warrants. Which is why we make law enforcement get warrants.
Demand Progress, MedicareforAllNow.org, Black Lives Matter, and Roots Action all help you tell your House Reps to pass H.R. 1976, the Medicare for All Act. Which would expand Medicare to everyone and (by almost everyone's estimation, though they often don't put it quite like this!) cost less than funneling trillions of dollars into our current health insurance system, the system that slams you with surprise thousand-dollar medical bills all the time and moves doctors in and out of networks all the time. With Medicare for All, we'd have one network, and we'd have the bargaining power with private hospitals and doctors that a 330-million-strong pool would have! Plus we could fund it merely by capturing the money big corporations already pay private health insurers in an employer-side payroll tax (and please note that "employer-side" means "employees don't pay one penny more"). Sounds like a win for the American people all the way around.