Credit is a long term gain. Other than utility changes it's hard to get any quick changes. Make sure you pay off your credit card before the statement cuts leaving that 9% or less balance. I would also consider opening two more lines. Three cards is a good minimum for a higher score.
I am trying to improve my credit score. I have one cc and recently increased my available credit to double what it had been and I have been paying ontime. I have tried to keep purchasing on card to 9% and of course paying it off at end of month. I also have a mortgage. Credit changed from 587 to 613. How long will it take me to get to 680 or 700+?