Term limits. Single term only. The terms 2 and 4 years are about right. 6 years for Senators would be about right if the 17th Amendment were to be repealed.
You cannot implement term limits without at the same time doing something about the permanent bureaucracy. Term limits without bureaucracy reform just empowers the entrenched Deep State moles even more. All legislators will be in a state of perpetual rookie-dom, ripe to be rick-rolled by life-tenured self-serving bureaucrats. If legislative term limits are implemented then something like the old Spoils System must also be implemented so that the weasels in the bureaucracy are also flushed out periodically.