There's groups like Run for Something that recruit progressives to run for state and local office
A surprising number of potentially winnable seats are never contested. Let's show up anywhere and everywhere to fight back
If you're worried about Republicans messing with elections themselves, you also have the power to help there too by running for state and local offices. Elections - even for federal positions - are run by state and local officals not by the federal government
If all you did was show up and say, "Fuck these guys" you'd get my vote. The bar for good governance has pretty much never been this low in the history of our nation.