I have had my Amex Blue Cash Preferred with a 10k limit for 12 months.  I use it frequently and of course always pay on time, usually 100% of the balance. My Fico is above 750.  I would like a CL increase. I entered $20,000 in their Check Spending Power tool and was approved. Does this mean that I could requested and be approved for a CL increase to $20K?