Stop using your credit card. Sure, it's easier said than done, but it's also exponentially easier to charge more to your credit card than it is to pay it off. It's tempting to put larger purchases like plane tickets on your credit card because you don't want to see those big amounts deducted from your bank account.
You're paying for those purchases no matter what method you use, and they will only end up costing you more when interest is added to those credit card balances. Bottom line: it’s difficult to rid yourself of credit card debt when you're still adding charges here and there, so embrace restraint when reaching into your wallet for that high-limit card of yours.