I'd do a combination of the above advice. Since they are no annual fee, I'd definitely keep them all open, in a drawer. And I'd put a reminder on my calendar to use each one once a year, so that they didn't get closed. And I (personally) apply for a new card every 3-4 months, rotating sign up bonuses. This is worth way more than 1-2% cash back. And I'd leave these new cards open indefinitely, unless they had an annual fee, in which case I'd close them before it kicked in. With the exception of SouthWest cards, I never open cards that don't waive the annual fee for the first year. For SW, I did it to get a companion pass (totally worth it).