I like some of Greysard's solutions.
Mine is dreadfully simple: ONE TERM.
No career politicians at all.
You may never be re-elected to any post, even dog catcher.
The concept of committees existing where my representative has less leverage than yours, simply because yours has been there longer is garbage.
These turds need flushing every 4-6 years.
Power is TOO corrupting for even the purest to abstain from abusing it.
After a generation of this, MAYBE we could talk about revisiting the Constitution.
Maybe.
To achieve your goals requires a state convention to amend the constitution.