I appreciate and agree with the sentiment, but I think a call to form an entirely new political party demonstrates a naivety with regards to how the American political system works. It's just not going to happen. A third party will NEVER displace one of the two major parties without massive changes to the electoral system that would likely require a Constitutional Amendment.
Our system and political culture is just not structured to allow for 3rd parties. What's more, the 2 major parties have ingrained themselves into the system so much that they have MASSIVE institutional advantages over a 3rd party.
This will never be a successful effort. I think a better goal would be to co-opt and take over the Democratic Party, booting out all the Vichy collaborationists like Schumer, Jefferies, Newsom, Adams, Pelosi, etc, and remaking the party.
With a new 3rd party, best case scenario is it has 0 impact. If it does get any votes, it'll just divide the anti-fascist vote with the Democrats (and any other 3rd parties) making it even more difficult to win.