1. Slice them up
The foremost thing is to reduce the number of credit cards that you own. Multiple cards mean more bills and more trouble. Limit the number of cards you possess and stick to only those cards that you essentially require. Just, cut up the extra cards, if you find that you are spending too much with them. This will prevent you from using them, since to make a purchase you need to call the credit card issuer and ask for a new card.