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As above posters have stated, as long as you make a small purchase and pay it off, you almost always get an increase. My account started off as freshstart with about 250 in 09/15. I am not up to 1,500 with no balance. I usually buy something small for about 20 or bucks or I usually buy PS4 controllers and then pay them off in 2 payments. That usually results in an increase.
Now that I think about it, I haven't bought anything since December so I should probably go find something on clearance and pay it off. LOL!
I hope you get an increase!