I have a stack of drawers labelled by colour and anything A5 or bigger goes in there, colour coded - pink/red - silver/blue etc

then anything smaller than A5 goes in a separate drawer - I have 2 - one labelled light colours/silver and the other labelled dark colours/gold for all the bits that I then usually ignore and throw away once every few years lolol

my cards are all bought the same size and divided by pieces of cardboard on shelves - as I have said lots of times before I just buy the big double fold blanks from craftcreations and get a reasonable range of colours (not all of them)