Well, there are many things we could do additionally to ranked choice voting:
automating the voter-registration could help especially the USA. We in Germany already have an automatic voter-registration. Everyone who is eligible (at minimum 18 years old and a german citizen) to vote in an election can automatically vote in it. It's a system that seemingly doesn't exist in the USA.
introducing a true protest-option in elections everyone who isn't happy with any of the candidates could chose like an "None of the above, draw by lot between all non-candidates"-option.
making voting securely possible from anywhere the voters are instead of just reducing it to a few voting-locations. There is a project named Follow-My-Vote ( https://followmyvote.com/ ) going into this direction. Unfortunately I'm not sure if they are still active or not.
expanding the duration of elections to f.e. a week instead of just one day. This would ensure that more people would have time to vote and could f.e. also negate the problem of a low voter-turnout because of bad weather in a system that still works over specific voting-locations.
RE: dTube: How would Steemit increase voter turnout WITHOUT making voting mandatory?