a 3rd party candidate is nothing more than a spoiler.

And there we go with the excuses.
In non-banana republics with a normal political landscape and populations with spines there have been parties and candidates scoring 1-2 percent, then 10, then 60. Or the other way.
That's how elections work, and nobody of those initial 1-2% voters gave up.
Since outside the US, nobody propagates that defeatist BS.

But OC, this election is “the most important election in history and in our lifetime” so now is not the time to rdo such crazy things as not vote for a duopoly you supposedly don't like but have since the beginning of your miserable country.

You have only yourself to blame and deserve zero sympathy.
On the contrary.
You're like an arsonist that constantly burns houses and now cries because he managed to set his own home on fire.
Well burn baby burn.