Congratulations on the approval. Was this your first business card? How long has your business existed? How many other vendors or lines of credit do you have reporting?
and what are your personal credit limits like?
I finally turned my sole prop into an S Corp 11.30 and applied for biz credit. I've gotten some ok results but my first card - Citi AAdvantage was only $5k like yours, and my AMEX HIlton was only $3k.
I've read that the more credit have reported as being used, the higher your credit line will be next go 'round.
Best of luck to you, your credit journey, and your business