If you're deciding between not voting or voting for a third party that has no chance of changing any major platform or winning an election, absolutely vote for a third party.
Either way you are consenting to the outcome.
Whether you vote protest to an unelectable third party or vitre strategically, what you do beyond the ballot box matters far more.
But the idea that a vote for the lesser of two evils isn't a vote for less evil? I don't buy that. Especially when the progressive needle was moved significantly under Biden, especially for climate.