A murder/suicide with the GOP would be a great starting place.
The problem is not the parties.
The problem is the entrenched lifer Elite Political Class. That class of Speshul Snowflakes which go into elected office directly out of university and create a lifetime sinecure, using coerced donor money to jigger elections. And use their tenure to enrich themselves.
The answer to this is - of course - TERM LIMITS.
The only way they can be imposed is with a Constitutional Amendment.
Since the lifers in Congress, and that's most of them, will not support such an amendment - even the n00bs in there HOPE to become lifers - since it will have zero support, the ONLY way out of this is with an Article V Convention of State Delegates.