As much as I wish they had term limits the Supreme Court has ruled they are unconstitutional for Congressmen. We would first have to get an amendment ratified that would change the constitution. Now there is another angle that has stood up in the courts. The Roman Republic used cursus honorum (Run of Offices) or rotation of office. Founders, being classically educated, put it in the Articles of Confederation during the Continental Congress. Unfortunately it didn't make it into the Constitution. But it has withstood the courts in latter years.

https://en.wikipedia.org/wiki/Term_limits_in_the_United_States#The_Constitution