Every branch of the federal government has experienced a decline in democratic accountability.
The House is so gerrymandered that only 10% of seats are remotely competitive each year, and it hasn't kept up with population growth.
The Senate is permanently gerrymandered, with state population differences that are far more disproportionate than what was originally designed for and intended when the Constitution was written.
This combined with hyper-partisanship prevents the US from accepting new states like Washington DC (population 700,000+) and Puerto Rico (population 3.2 million), depriving millions of US citizens from Congressional representation (no, non-voting representatives don't count).
The Supreme Court has become hyperpartisan, and appointments are a high stake circus that rely on arbitrary retirements and deaths. They need to be elected at this point to preserve democratic legitimacy.
As for the Presidency... the Electoral College has resulted in the election of the loser of a popular vote twice in 25 years.
I don't know how reform will happen, or if we'll ever see it in my lifetime but we desperately need it. The US government needs to be accountable to the people again.
Democracy is precious, and it's so tragic to see how much it's declined.