Your FAA commercial license does not expire. If you want to use it to fly in the USA you only need what any pilot needs - a current medical, a biannual flight review within the last 2 years signed by an FAA CFI, an instrument proficiency check if you intend to fly in IMC, landing currency if you intend to fly with a passenger on board (not for pay), and a photo ID. If you have an FAA commercial pilot license, this should be information you already have, right?