> strategic voting is rational behavior
Is it? How many large-scale elections are decided by one vote?
I'm well aware that that the 2000 US Presidential election was officially decided by 537 votes (in Florida, though recounts were not allowed). Nonetheless, 537 votes is not 1 vote. If one person had changed their vote, it wouldn't have made a difference. If two people had changed their votes, it wouldn't have made a difference. If three people had changed their votes, it wouldn't have made a difference. You could try to coordinate all of your friends and family (in Florida), and it still wouldn't have made a difference.
Realistically, the chances of your vote changing the outcome of a large-scale election with millions of voters is practically nil. You have better odds of winning the lottery; as proof, people do actually win the lottery! But buying lottery tickets is not generally considered to be rational behavior.
Admittedly, there are a number of smaller, local elections that have been decided by one vote. In general, though, I would consider strategic voting to be irrational, indeed delusional.
If you want to significantly influence the outcome a large-scale election, then become ultra-wealthy and throw your money at politics. (Or you could just ignore the elections and buy off whoever wins.) The irony is that in a democracy, every vote is equal, which means none of us individually has any power as voters.
You don't need "ranked choice voting" or any other convoluted system in order to "vote your conscience", as it were. You could just do it, but we just don't.
I'm not suggesting that you ought to vote your conscience, by the way. It really doesn't matter one way or the other. But that's precisely why you could if you wanted to. From a kind of Kantian moral framework, you might vote as you would want everyone else to vote, and in that case, if you truly hate the two major political parties, then why would you vote for them, and want everyone else to vote for them? I don't believe that makes sense either strategically or morally.