It's actually incredibly difficult to get a constitutional amendment heard and ratified. Even the equal rights amendment was shouted down despite massive bipartisan support.

[Note] Also, such an amendment has already been sent to the states and failed. https://en.wikipedia.org/wiki/District_of_Columbia_Voting_Ri...

I'm not denying that it's difficult, but it's been done, depending on how you want to count, either 27 or 18 times already. And there's no rule saying you can't consider an amendment again if it doesn't pass once.