
Time to ask your credit card companies for a gift - a credit limit increase. I have a detailed post on why you want to do this here, but the short version is:
Increasing your credit limit, decreases your credit utilization, which increases your credit score. See the above referenced post for why.
This assumes you do not go out and spend your new credit. If you can't control yourself, don't do this.
I got my credit limit increased by $3,000...