On the player page for an individual, just beneath the Bio information, there are links for "Overview", "Cards", "Contributors", etc.
"Filters" is the fifth link and give you options to filter by card number, team, brands, sets, notes, etc.
I'll never quit collecting entirely, but I am downsizing. Check out my COMC store and help me thin out what I don't want so I can buy cards that I do want. See something you like? Send me a message on here, and we can knock the price down quite a bit. I'll even take a bit of a loss if it means getting you a card you really want.