I use one card for a subscription service and one for curbside grocery pickup, paying them off monthly. That keeps them active so I have when needed for travel expenses. One is locked up in my home filing cabinet. The other is wrapped in a long strip of paper in my wallet, so I have to unwrap it to use. The wrapping is a reminder not to use the card frivolously, because after two decades being debt free, I still need that reminder occasionally.