According to Chris Hedges, Green Party has had to pay over a million dollars in legal fees to defend their right to ballot access. That's a lot of money for a small, grassroots party with no corporate backing. Make no mistake: the Democrat party is vicious and will sue and litigate against the Green Party every step of the way. They blame the Green Party for Hillary Clinton's loss to Trump since Green Party exceeded the margin of Trump's victory in some key states. Yet democrats have also not lifted a finger to fight for Ranked Choice Voting nor Star Voting and indeed have often fought against it. Nor do many Dems acknowledge many GP voters would not have voted for Clinton under any circumstance.
At this point, I think the Green Party has only secured ballot access in about 20 states. In the best case scenario, GP might be able to secure 20 more. Every state has different laws and hurdles to jump thru, and many of them are ruled by aggressively hostile Democrats, the very same ones who put their finger on the scale to try to keep progressives within their own party from winning.
It's a long, sad, expensive journey. But democracy is worth fighting for.