How many fucking times do I have to explain it?

No one knows your chosen third party candidate exists, and unless you want to become their campaign manager that will still be true in November. Even if you did, they still wouldn’t win.

In the last election, Biden got 50% of the popular vote, and Trump got 45%. Say for the sake of argument that if nothing else happens, 2024 will have the exact same spread. Suppose you’re the best campaign manager ever and manage to convince 2/3 of the people who would have voted for Biden, plus everyone who was going to vote third party, to vote for your candidate instead. (Given the current state of money in politics I should not need to explain why this is infeasible, but suppose it is.) Congratulations! Your candidate now has 37% of the nationwide vote. Unfortunately, that’s not good enough, because Trump’s voter base, who care not for your leftist policies, still gave 45% of the vote to him, and he wins the election.

All voting third party instead of Biden does is make it more likely that Trump will win.