

You have a few options for enacting ranked choice voting at the national level:
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Win hundreds, possibly thousands, of state-level House and Senate seats with the largest grass roots voter mobilization ever seen in the US to, a) enact legislation in all 50 states or b) ratify an amendment to the constitution, that mandates it.
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Kill enough republicans in a national civil war to make sure that when elections happen, there aren’t enough republicans left to win an election, then enact the above.
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Overthrow the entire US government in a much bloodier national coup and set up whatever government you want.
It isn’t, but I suppose if you hang out in an echo chamber long enough you’ll believe anything.