I'd give it maybe another couple of months. Normally, when they do increase you, it is a 6 month wait until you can get another increase. But if denied, you can keep trying. They don't seem to give big limits on this card for most people.
@Anonymous wrote:Sorry to hear about the denial. In your case, you should try in 12 months as that is enough time for the new accounts to age.
+1 YIM. Citi definitely likes to have some good time and distance from new accounts prior to granting a CLI. 
@Anonymous wrote:My DC was one of the 3 cards I had when I found this board and started working on my credit. While acquiring too many cards, I've been counting down the days for a 6 month CLI with this tiny card because it would really be nice not to have to pay on it 3 times a month to make it usable.
Apped for SP CLI and denied for only one reason...too many new accounts.
I was so focused on score and usage (they approved me with a 602) that I thought I had it in the bag. I'm not upset, but definitely bummed.
I'm already back in the garden, but I'm curious to know of those that have Citi, how long before I should try again? 6 mos? 12 mos? Citi Costco and BofA Cash Rewards have yet to report as well.
I've been waiting since Dec 2014.
Sorry about the denial 
I feel a denial coming my way too next month, when I hit 6 months post CLI... 5 new accounts since then!