You should know very well that in a FPTP system, particularly the type the US has, additional political parties do nothing to help democracy. Arguably they make it worse:

• 30% vote for liberals and hate fascists
• 30% vote for leftists and hate fascists
• 40% vote for fascists

60% of voters hate the fascists, but they still win the election. This is exactly how the Nazi party took over a democracy.

You have to play big tent politics in FPTP. We need a ranked choice, parliamentary system before adding parties will improve democracy. And that happens by taking gradual control of a party and pushing it that way. It isn't going to come from a third party entering the fray --

UNLESS, one of the the main two parties fractures away. And we are currently in a dynamic where Republicans are close to doing so. Firmly beating them in November may lead to a total breakdown of the party, and then Greens could attempt to assume their role as the second major party in the US. That's the fastest way we can get to national ranked choice voting.