I don’t disagree with the idea of term limits.
My plan is 12 years - two 6-year terms in the Senate or six 2-year terms in the House.
Rightly or wrongly, a legislative body needs to have some institutional stability and history. With the kind of turnover that we’d see if everyone was restricted to six years, it would not be good for the nation.
I like your plan better. Frequent elections in the House were intended to keep representatives responsive to the people.