Personally: Seeing real adoption. I don't care if its Bitcoin, Ethereum...even Ripple (preferably not Ripple, the game we are in is "supposed" to be decentralised)...but yes, adoption with real use, especially in struggling parts of the world. It would make me personally happy seeing a bit more economic freedom in the world, without 3rd party / counterparty risk, frozen accounts, begging entities to give you your money. Communicating with people even on this forum is motivating, chatting with some likeminded people, its lovely