Harris has received a vote of confidence from virtually every Democratic governor, high ranking DNC member, politically active liberal, Biden bro, and most importantly, Democratic donor. Her campaign has raised over 200 million dollars - that's 2 and 8 zeroes - in the past week alone. And that's not including Biden's former campaign funds or future donors either. She will be fine. The people you scoff at in the tags won't.
If you are not in any economic class higher than the 5% (maybe not even that) your money would go further to help people by giving to the ones next to you.
If you want to fight to make sure Harris wins, you can give your time, your advocacy, your connections to encourage people to vote for her. You can help people get to voting places, you can emphasize the danger that P2025/A47 poses, you can encourage people to trust in someone who isn't decomposing in real time.
Building up your community, however, is the strongest option.