I shared mine via Apple Wallet and social media. Add Digital Business Card to Apple Wallet and share it as an Apple Wallet pass, for example. The cool thing is that you can also share it via Siri once you add it to your wallet, but I'm yet to try it out that way. Or I just click on the social media platform's icon on which I want to share my card. You can also share it as your email signature, or as an URL, but I've only tested the first two I mentioned so far. Both work well for me.