When I was clearing out my parents’ house, I found a stack, oh, four or five inches tall(!), of business cards stacked on my father’s dresser. I’m sure that he kept these for “reference” although he probably never hired most of these businesses.
If you like to hold onto business cards, keep them in one location. Weed out those that you don’t need. Don’t bother trying to organize them because it’s not like you need multiple business cards for plumbers, just the one you work with.
And, if you have the number in your phone, you don’t need the business card at all.