Glad that you asked what you can productively do! It’s a wonderful question.

• National Popular Vote Compact - Has lots of links and information about how to help. IDK how active this is; it seems like the effort has died down in the last few years, but in the time they were doing something they managed to get 205 of the 270 electoral votes they would need in order for it to take effect.
• Ranked Choice Voting - This one is complementary to the above, and also has had some recent traction. It’s on the ballot this year in Oregon and Nevada. In the 2022 election, it won in 8 of the 10 jurisdictions where it was on the ballot, including statewide in Nevada (this year’s election is a required second proposition before it can actually take legal force). There’s a “Get Involved” link in the header, the clicking of which will do more to change the democracy-situation in the United States than will posting discouraging messages on Lemmy.