Would like to cancel my 15k Arrival plus card. It is my second highest limit. Six months ago, I was approved for the First National Bank 2% card and I enjoy being able to redeem for anything without an annual fee.
I tried to downgrade three times to a no AF card but each time was told no.
My current reported Credit Card balances total 741 on 67,000 in credit lines (not counting the Arrival Plus).
Assuming you're not carrying like $10k in balances (and really need all the help you can get with utilization), I'd go ahead and close it.
Some people do downgrade successfully, but others don't get the offer. When you call to close, it might be worth asking one last time.