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My only suggestion regarding the CLD is to try calling Credit Solutions and seeing if they are willing to give a CLI. It may not be likely, but it could be worth a shot.
For the future, I recommend setting up auto-pay, or at least schedule your payments ahead of time, so you don't forget it. Also, are you using the Walmart MC for special financing? With the interest rates they have for standard purchases, I certainly hope so.
My only concern here is that you have a balance of $5000 on a Walmart card and if memory serves me right, the APR on them are usually astronomical. Unless your taking advantage of a special 0% financing offer, you NEED to get rid of that balance ASAP! If u can't PIF just balance transfer to a lower/zero rate card. As far as restoring your previous limit u can certainly attempt to hit up Credit Solutions but in the grand scheme of things, only time will bring u back to where u was limit wise. I honestly doubt they'll be willing to approve any increase at this point when u were just delinquent.