Your FICO is affected by the total available credit you have to you, as it compares to the percentage that you use monthly. I.e. if you have 50k of combined credit card limits "available", and you use up to 5k per month, you are using up 10% of your available credit.
You don't want to use high percentage of your "available" credit as it directly impacts your credit score. It's ok to have a couple of idle cards, or ask for a higher limit on the cards you use. Generally it's best to have balances being low percentage (ideally under 5%) of your total available credit.
Another point that affects your credit score to consider is the "age" of your credit history, how old your credit is, older credit cards improve your score.
I didn't realize BofA offers 2.6% cash back across the board and not in certain categories. Is this in their Unlimited Cash Rewards card with the higher honors tiers? I may have to get that, I've been using Citi DoubleCash for 2% back, but this sounds even better.
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