While the US doesn’t have a parliamentary system, it’s functionally impossible to win the presidency without a nation-wide party with a presence in multiple states backing you. This is because the president is elected by the states so you need the infrastructure capable of winning a plurality of voters in multiple states which you can test by your party’s ability to win senate seats or governorships. Additionally, you would need support of enough members of Congress to actually implement any policy while during your term.

Most third-party presidential candidates in the US are grifters or fools as evidenced by the fact that they’ll run for president every year without even attempting to build out party infrastructure, push for alternative voting via citizen ballot initiatives, or win lower positions necessary to actually be successful.

Making third parties viable in the US is possible, but it will take a lot of work. It’s far easier to hijack one of the existing parties the way the Tea Party and later, Trump did.

Your choice was Jill Stein who shows up every four years to siphon money and attention from effective leftist movements and doing shit all in between. Not organizing, not trying to get green candidates elected to Congress or even state assemblies, not collecting signatures for citizens ballot initiatives to end fptp, nothing. All she does is collect donations for recounts in blue states that never happen and have dinner with Putin.

You voted for a grifter who promised you what you wanted while robbing you of your ability to ever have it.