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Put the contact information from business cards of people you actually might contact into your phone and get rid of the cards or leave them at home. Use apps on your phone to store card info to limit the number of cards you need to carry around. If you have an iPhone you can use Apple Wallet to carry digital card info, or if you have an Android phone you can use Google wallet. Carrying a bunch of your own business cards to hand out in your wallet is an easy way to bulk it up. Get a separate business card holder to carry your cards and free up space in your wallet. You can also digitize your own business cards by using a mobile app to create digital versions that people can read with their phones by scanning a QR code. Coins take up a lot of space and add a lot of weight to your wallet. Take them out and put them in a jar to save up for a rainy day. If you actually use change and insist on carrying it, then use a wallet that has a small zippered pouch for coins. Get a wallet that has just enough space for your essential items. This will keep you from filling it up with things you don't actually need. You can get a small front-pocket wallet, that just has room for cards, and carry a small amount of cash separately if needed.
Digitize any information that you can to avoid carrying it with you. Put business cards in a separate business card holder if you use them. Store your loose change somewhere other than your wallet. Choose a wallet that is a suitable size for your needs.