<prompt> Human: Ive had a Discover IT credit card for the last 4 years. Its a student card. The limit started at 300 and progressively changed to 1000, which it has been at for quite a while. All I use it for is gas and my phone bill, and Ive paid if off every single time, Ive never paid interest on it. Now that Im married, those expenses have increased, I still pay it off every single month but it gets very close to the limit between payments, which Ive heard looks bad. I want to get a new card with a higher limit so that Im using a lower percentage of credit, whatever thats called. Ill use it the exact same way I just want to keep improving my credit, which is somewhere in the high 700s currently.What do I do with the old card? Do I just stop using it? Do I close it? Im not sure what the smartest way to go about this is  <response>: dont close it. leave it open and you can choose to spend on it or not. or you could put a re-occuring bill on it and pay it off every month, so the issuer discover wont close it 