The democratic party is literally designed to squelch any kind of true progressivism. They are funnel any movements into "voting blue no matter who" and make people like AOC say bullshit things like "Biden is working tirelessly for a ceasefire" which we know if bullshit after Biden aides admitted they did not.
We need to make ourselves heard, aboslutley. And waiting for the elections is a recipie for failure indeed. But you say all these things about registering for democratic primaries or canvasing or "changing the party" without realizing people who have been paying attention have been trying that for decades. The democratic party is designed to maintain the status quo, and be as big of a roadbump as possible to actual workers demands so that they can keep campaigning on being better than the GOP. We are not reforming the democratic party when its whole goal for decades is to trap people trying to demand actual reform.
We need to make demands, absolutely. But we need to throw off the shackles of thinking the prison guards are going to help us escape. We need a new party, not a new Democrat.