You might enjoy Joshua Citarella's Doomscroll podcast.
Repeating myself: Very few people within a system will work to reform that system. Why? System justification theory? Pulling the ladder up after oneself? Mr Smith Goes to Washington? I honestly have no clue.
For example: public financing of campaigns. The painfully obvious correct solution. Initially, I naively thought every politician would be onboard. Fund raising sucks. All the players complain about it. So of course it'd be an easy sell.
(I worked on adjacent issues. Us ragtag groups would support each other's causes as able. These activist communities are very small. eg fairvote.org)
Now 20 years later, how many jurisdictions have public financing? And in the places which did adopt it, it's under constant siege.
Ditto ranked choice voting.
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I support building a Climate Cabinet style PAC for every issue. Laser focused. Money ball for campaigns, matching contributors with select candidates. So an org fairvote.org would strategically support candidates committed to RCV. (Of course, it'd have to be new org. Because it's super hard to rewire an existing org to function differently.)
I have no clue about building movements. My pathetic attempts failed utterly. I'm wide open for ideas and input.
So pick a better coalition. Ditch the identity-politics leftists in deep-blue cities and win back workers in swing states.