This is the way. As a voter it often feels like your vote doesnt matter. But the thing is focus on local elections. Vote in every election your allowed. Especially those off season elections have low turnout, and your vote matters much more. This is how you get demsoc candidates into positions of influence who can work their way up.

The republican party is full on fasc. No matter where you are dont vote for them. Make the red states have to cheat so obviously that the courts have to get involved. Swing states vote blue, but if you were voting in the local elections, and primaries theres a good chance your blue candidate isnt a centrist. If your in a solid blue state vote for the third party to show the centrist dems that you dont want a centrist, and that their hold is precarious. If youre lucky to have a leftist candidate on the ballot in a blue state vote for them.

This is the best way to tell the party how to win. They will ignore you, and they will fight you. But if their base votes hard left consistently they have to listen, or they lose to leftists.