It may take a century or two, but tat-for-tat, eventually a 435-member Supreme Court. Pack the HELL out of it.
And in the meantime, let's admit DC and PR and Guam and Samoa and then split up the rest of the states and get a 435-member Senate.
Then let's elect 435 presidents. It's only fair.
Although then we might have to expand to 870 of each to keep it fair. That would be even more democratic. But first things first. One constitutional miracle at a time.