Great start. Now put those cards to work on a perpetual basis. First, the profitable one. See the thread down from yours on tradeline sales? Go learn about that, send a PM to Joe (arebelspy) and get those cards that qualify in with the old company. Make yourself a spread sheet and throw $3 every month on the cards you've sold in Amazon gift card reloads.
Next, take all your cards and look up "low balance forgiveness". You can start with their list or you can put 99 cents on every card that doesn't have a tradeline sale on it. Of course, set up every card for automatic payment. After the next bill comes around for each card, see what cards fogive 99 cents. Hint....Wells Fargo and Discover forgive $1.99 a month.
Being organized helps. If in doubt on a tradeline, just throw $3 on there. You don't want a "did not post" note in your listing. They will occur now and then without any reason you can figure out, but you don't want to miss because you forgot to put a few dollars on it to report to the credit agencies.