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Everyone's scenario is unique, I know people in your income range that started off with low limits, and some with ~ 15k limits. After their next account review (you will see threads here in the applications section when it happens) do a CLI request for the soft-max $25k, you will either get $25k or they will counter you with a lower offer. Repeat during the next cycle until you hit $25k.
Good Luck
Good Luck when you CLI... I'm in the same boat, i got a 1k SL and a low income as well. I'm not eligible till 8/6 at the earilest and i've heard the next AR is Sept 1st, so i might try to wait for that. Here's to going for a big CLI..