The perception of a particular office-holder as a "dictator" is a very relative thing.
Except in this case Trump has promised to be a dictator: https://youtu.be/aX0iAmz9iLM?si=PbFCWr6CvpJ-nlXc
Also he was the first president in history to refuse a peaceful transition of power and attempted to overthrow the democratic process.
It would be functionally impossible to adopt ranked choice voting...
You don't go about it from the federal level. States control their own elections. We could use state-level ballot measures to let the public vote for ranked choice voting state by state.