Well, the first two (replacing first-past-the-post and eliminating the Electoral College) can be done on a state-by-state basis. There were ballot initiatives in a few states on the ballot in 2024 regarding instant-runoff voting. All of them failed, including one in Alaska that would have repealed instant-runoff voting and replaced it with first-past-the-post.
The Electoral College can be defeated using the National Popular Vote Interstate Compact.
Well, the first two (replacing first-past-the-post and eliminating the Electoral College) can be done on a state-by-state basis. There were ballot initiatives in a few states on the ballot in 2024 regarding instant-runoff voting. All of them failed, including one in Alaska that would have repealed instant-runoff voting and replaced it with first-past-the-post.
The Electoral College can be defeated using the National Popular Vote Interstate Compact.