Oh, OK, gotcha. Around here, "credit repair" is a term used for less than ethical and downright dishonest ways of manipulating your credit reports to improve your scores. It gets wonderfully confusing, because many use the same term to refer to what you're trying to do --improve your overall credit picture, thus raising your scores.
Since you're only listing one FICO score, I'm guessing that it's your EQ FICO (Equifax.) You actually have three scores, one from each bureau --Equifax (EQ), TransUnion (TU), and Experian (EX.) In almost every case, these are different from each bureau, because each uses a formula different from the others that varies different behaviors.
If you can post the info that's on your report, listing all your open accounts and closed accounts, dates opened and closed, credit limits, current reported balances, any negatives including late payments, chargeoffs, and so forth, and any other relevant info, we should be able to give you some pointers.
If you don't have any baddies within the last two years, or any major baddies overall, I'm guessing that your main problem is that you only have the one CC. Revolving credit carries a lot of weight in FICO scoring.
In the meantime, please also read Credit Scoring 101, which is stickied at the top of this forum. That will give you a useful and thorough overview of how all this stuff works.
* Credit is a wonderful servant, but a terrible master. * Who's the boss --you or your credit?
FICO's: EQ 781 - TU 793 - EX 779 (from PSECU) - Done credit hunting; having fun with credit gardening. - EQ 590 on 5/14/2007