@freemo @arteteco Not sure if they have them this year, but in 2016 they had vote trading websites where people in swing states could swap votes with people in solid-(blue|red) states.
If you're in a swing state but want to vote 3rd party, you find someone in an "uncontested" state who wants to vote mainstream. They vote for your chosen candidate and you vote for theirs.
I don't remember if there was any mechanism for enforcement (though I imagine there can't be — anything that can be used to enforce a vote trade could also be used to use violence or payment to influence votes).
@freemo @arteteco This one seems active this year: https://www.votepact.org
Though you have to find your own person to pair up with.
@arteteco Jo Jergensen is one of choices i keep waffling between.. Jo is clearly the best candidate on the ballot