Here's how to abolish the electoral college: https://en.wikipedia.org/wiki/National_Popular_Vote_Intersta...

States with a total of 270 electoral votes agree to award their electors to the winner of the national popular vote. The effort appears to be stalled, but there are 209 votes from states who've already passed the law (which is in effect only once 270+ electoral votes are reached).

The Supreme Court's composition can be changed with a law, and the most popular option appears to be 18 year terms, staggered so that there are two appointments for each presidential term. The court can also be expanded, and should be to 13 (one for each circuit).

Gerrymandering is a serious problem, and would properly be solved by coming up with some algorithmic way of drawing districts. But for practical purposes this unlikely to ever happen. But I'm hopeful because of the effort of Democratic states to recognize the gerrymandering and turning it into a standoff of sorts. To date, there's been no reason not to gerrymander if you can do it, and Republicans have seriously overreached.