Hi supertee, and welcome to the forum.
The two biggest factors in your score are lates and %util.
Your are at 60% util or above in four accounts, and above 70% overall. This is the biggest factor hurting your score.
Get them all down below 50% as a big first start. First major increase in scoring is to get all accounts below 50% util, with the goal of under 10%.
The lates are apparently legitimate. You can try to GW them away, but that is only at the mercy of the CCC wolves. So no harm in a try. Sooner the better. Lots of crocodile tears.
Closing the CITI account was not good for FICO score, for once it reaches zero balance, you will lose all of its agiing history, along with its CL of $4000. Your CL will drop, your %util will go up, and you will lose its time in your avg account aging.