“Swinging the election” means taking away enough votes from one candidate or the other to make them lose.

Your average Green voter would vote for Harris over Trump given no other choice.

Your average Libertarian voter would vote for Trump over Harris given no other choice.

So let’s see how that worked out:

2020:

https://en.m.wikipedia.org/wiki/2020_United_States_presidential_election_in_Georgia

Democratic - Joe Biden - 2,473,633 - 49.47%
Republican - Donald Trump - 2,461,854 - 49.24%
Libertarian - Jo Jorgensen - 62,229 - 1.24%
Green - Howie Hawkins - 1,013 - 0.02%

In Georgia, the Greens are a rounding error. They have zero impact on the election.

The Libertarians though, check that out… Trump lost by 11,779 votes. That means if just 18.93% of those who voted Libertarian had voted Trump instead, he would have won.

2016:

https://en.m.wikipedia.org/wiki/2016_United_States_presidential_election_in_Georgia

Republican - Donald Trump - 2,089,104 - 50.38%
Democratic - Hillary Clinton - 1,877,963 - 45.29%
Libertarian - Gary Johnson - 125,306 - 3.02%
Independent - Evan McMullin - 13,138 - 0.32%
Green - Jill Stein - 7,736 - 0.19%

Clinton lost by 211,141. Even if you added up all the “also ran” candidates, 146,180 votes, that would not have been enough to swing the election to her.