Don't let anyone tell you your vote doesn't matter. It's your voice, people fought and died to win that right, and if it didn't matter, powerful people would try so hard to take it away.
Don't let anyone tell you that not voting is a form of protest either. All it does is mean someone else chooses your next government because you silenced yourself.
Don't let anyone tell you there's no difference between Republicans and Democrats either. I remember the masses of bodies in freezer trucks during early Covid. I remember who sent a mob to try to lynch Congress when he lost an election, and which party called it "legitimate political discourse". I remember who's actively trying to take away abortion rights, and trans rights, and block any kind of gun control, and reverse even the modest gains we've made on health care and climate. It ain't Democrats.
And don't think your vote doesn't matter just because you aren't in a Presidential swing state. First, because there's a lot of conflicting information about how close some states are. And second, because even if you know how your state is going to vote for President, there are still down-ballot races. Like House and Senate seats, without a majority of which the next President will be able to do very little, to say nothing of the fact that a Republican majority might refuse to certify a Democratic election win at all.
Are you in Montana or Ohio? Harris may not win your state, but a vote to reelect Senator Tester (Montana) or Sherrod Brown (Ohio) could help Democrats hold the Senate.
Texas? You could help Colin Allred unseat Ted Cruz. Florida? Debbie Mucarsel-Powell needs your votes.
Even Nebraska has an Independent, Dan Osborn, who has a very real shot at unseating a Republican Senator.
And if you are turned away at the polls (like if they've purged your name from voter rolls), remember that you have a legal right to demand a provisional ballot with receipt.
Authoritiarins want you to feel helpless.