Scott Alexander wrote a nice article on what the Republican's program could/should be: https://astralcodexten.substack.com/p/a-modest-proposal-for-republicans?s=r   

While not directly EA, I think fiction isalso great to promote some ideas from the Progress Movement, namely humanism, agency, and the idea that "problems are hard, but solvable".

I also feel that the idea that "actually, humans are good, and humanity is worth protecting" needs some promotion. We are not just some greedy, aggressive, nature-destroying species that the earth would probably be better off without!