Look at your keys. Are you carrying a five pound ball of metal, rubber and plastic? I have found that I only need a single keyring with keys for my car, apartment, and office. For rewards cards I tell the store clerk my phone number and they’ll honor my rewards points.
Losing my keyring is unlikely because I keep it either in my pocket, a bowl by the front door, or in my laptop bag. All of this is just another step in simplifying my life and carrying only the essential with me.